Art: Steven Belledin · © Wizards of the Coast

Haste
Whenever Arthur and at least one other creature attack, look at the top six cards of your library. You may put a creature card from among them onto the battlefield tapped and attacking. Put the rest on the bottom of your library in a random order. Return that creature to its owner's hand at end of combat.
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Pulled from EDHREC — cards most often included with Arthur, Marigold Knight.

Brago, King Eternal
Top Cards

Dour Port-Mage
Top Cards

Angel of the Ruins
Top Cards

Ephemerate
Top Cards

Éowyn, Fearless Knight
Top Cards

Sun Titan
Top Cards

Windcrag Siege
Enchantments

Solemn Simulacrum
Top Cards

Medomai the Ageless
Creatures

Arni Metalbrow
High Lift Cards

Cloudshift
Instants

Trumpeting Carnosaur
Creatures

Peregrine Drake
Creatures

Mulldrifter
Creatures

Claim Jumper
Creatures

Aether Channeler
Creatures

Port Razer
Creatures

Moonshaker Cavalry
Creatures

Restoration Angel
Creatures

Cloudblazer
Creatures

Brainstorm
Top Cards

Knight of the White Orchid
Creatures

Ilharg, the Raze-Boar
Creatures

Reconnaissance
Enchantments

Sneak Attack
Enchantments

Spirited Companion
Creatures

Cavalier of Gales
High Lift Cards

Manifold Mouse
High Lift Cards

Loyal Warhound
Creatures

Anticausal Vestige
Creatures