Demon's Den

Creature — Sliver

All Slivers have "{1}, Sacrifice this permanent: Each player discards a card."

Artifact Creature — Construct

This creature enters with two +1/+1 counters on it. {1}, Discard a card: Put a +1/+1 counter on this creature. Remove two +1/+1 counters from this creature: Draw a card.

Enchantment

When this enchantment enters and whenever you draw your third card each turn, amass Zombies 3. (Put three +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Sorcery

Target player discards two cards. Overload {1}{B} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Sorcery

Target player discards two cards. Put up to one land card discarded this way onto the battlefield tapped under your control.

Sorcery

Target player discards two cards.

Legendary Artifact

{4}, {T}, Sacrifice Mindslaver: You control target player during that player's next turn. (You see all cards that player could see and make all decisions for them.)

Creature — Horror

When this creature dies, each player discards their hand.

Sorcery

Gift a tapped Fish (You may promise an opponent a gift as you cast this spell. If you do, they create a tapped 1/1 blue Fish creature token before its other effects.) Target player draws three cards. If the gift was promised, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Creature — Merfolk Wizard

Exhaust — {X}{U}{U}, {T}: Draw X cards. Put a +1/+1 counter on each Merfolk creature you control. (Activate each exhaust ability only once.)

Artifact

{T}: Add {C}. {1}, {T}, Sacrifice this artifact: Draw a card.

Instant

Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/5. Draw a card.

Creature — Rat Wizard

At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put it into your graveyard.) Threshold — As long as there are seven or more cards in your graveyard, creatures your opponents control get -1/-0.

Creature — Human Rogue

Trample When this creature enters, if you control another outlaw, create a Treasure token. (Assassins, Mercenaries, Pirates, Rogues, and Warlocks are outlaws. A Treasure token is an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Creature — Bird

Flying, vigilance When this creature dies, target creature you control explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)

Creature — Spider

Reach When this creature enters, you may mill two cards. (You may put the top two cards of your library into your graveyard.)

Enchantment — Aura

Enchant nonland permanent Enchanted permanent is a Treasure artifact with "{T}, Sacrifice this artifact: Add one mana of any color," and it loses all other abilities. (If it was a creature, it's no longer a creature.)

Enchantment — Aura

Flash Enchant creature When enchanted creature dies, return that card to the battlefield under your control.

Creature — Human Cleric

Afterlife 2 (When this creature dies, create two 1/1 white and black Spirit creature tokens with flying.)

Instant

Counter target spell with mana value 1 or less.

Creature — Horror

When this creature dies, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.")

Legendary Creature — Human Cleric

Vigilance, lifelink Whenever you gain life, put a +1/+1 counter on each Cleric you control.

Land — Desert

This land enters tapped. As it enters, choose a color. {T}: Add one mana of the chosen color.

Creature — Zombie Merfolk

Deathtouch When this creature enters, mill two cards and you gain 2 life. (To mill a card, put the top card of your library into your graveyard.)

Legendary Creature — Human Druid

During your turn, Mounts and Vehicles you control have hexproof. Whenever a Mount or Vehicle you control attacks, put a +1/+1 counter on it.

Creature — Elk

Trample Whenever this creature enters or attacks, return target Elf card from your graveyard to your hand. You gain life equal to that card's power.

Creature — Spider

Deathtouch Whenever this creature attacks, target legendary creature you control gains deathtouch until end of turn.

Creature — Elf Scout

Whenever a player attacks you, target attacking creature gets -2/-0 until end of turn. Whenever a player attacks, if they aren't attacking you, that player chooses an attacking creature. It gets +2/+0 until end of turn.

Artifact — Equipment

Flash When this Equipment enters, attach it to target creature you control. Equipped creature gets +2/+0. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

Artifact — Equipment

For Mirrodin! (When this Equipment enters, create a 2/2 red Rebel creature token, then attach this to it.) Equipped creature gets +2/+1 and has vigilance. Equip {3}{W} ({3}{W}: Attach to target creature you control. Equip only as a sorcery.)

Land — Sphere

{T}: Add {C}. {T}: Add one mana of any color. Activate only if this land entered this turn. {3}, {T}: Create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and "This token can't block." (Players dealt combat damage by it also get a poison counter.)

Instant

Destroy target creature that was dealt damage this turn. Draw a card.

Creature — Shapeshifter

You may have this creature enter as a copy of a creature you control.

Creature — Dwarf Soldier

When this creature dies, the Ring tempts you.

Legendary Artifact

{5}, {T}: Scry 1, then draw a card. This ability costs {1} less to activate for each legendary creature you control.

Artifact Creature — Crab

Ward {3} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.) Channel — {2}{U}, Discard this card: Counter target spell or ability unless its controller pays {3}.

Instant

Counter target spell unless its controller pays {2}. Cycling {2} ({2}, Discard this card: Draw a card.)

Instant

Counter target instant or sorcery spell unless its controller pays {3}.

Creature — Human Wizard

Flying Whenever you draw your second card each turn, create a 1/1 blue Faerie creature token with flying.

Creature — Dog

Flash (You may cast this spell any time you could cast an instant.) When this creature enters, return up to one other target permanent you control to its owner's hand.

Creature — Shapeshifter

Changeling (This card is every creature type.) Flash

Legendary Creature — Human Artificer

Haste {1}, {T}, Discard a card: Draw a card. Whenever you discard one or more artifact cards, add {R}{R}. This ability triggers only once each turn.

Land

{T}: Add {C}. {1}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land. {T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Artifact

{X}, {T}: Tap X target lands.

Instant

Surveil 2, then choose an instant or sorcery card in your graveyard. You may cast it this turn. If that spell would be put into your graveyard, exile it instead. (To surveil 2, look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Creature — Frog Warrior

At the beginning of your upkeep, return another creature you control to its owner's hand. If you do, put a +1/+1 counter on this creature. Otherwise, you may return this creature to its owner's hand.

Creature — Merfolk Warrior

This creature can't be blocked.

Artifact Creature — Robot Soldier

Whenever you cast an Aura or Equipment spell, put a +1/+1 counter on this creature. When this creature dies, create X Junk tokens, where X is the number of +1/+1 counters on it. (They're artifacts with "{T}, Sacrifice this token: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.")

Legendary Creature — Human Villain

At the beginning of your upkeep, choose one — • Put a +1/+1 counter on Mister Hyde. • Remove a counter from a creature you control. If you do, draw a card.

Creature — Eldrazi Drone

Devoid (This card has no color.) Flying Ingest (Whenever this creature deals combat damage to a player, that player exiles the top card of their library.)

Creature — Kithkin Advisor

This spell costs {1} less to cast if you control a Kithkin. When this creature enters, draw a card.

Creature — Siren

Flying Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Land

This land enters tapped unless you control a Mountain or a Forest. {T}: Add {U}. {U}, {T}: The next spell you cast this turn can't be countered.