scheme cards mtg Magic: The Gathering: Archenemy Promos, Pt. 1: Enhanced Scheming! They gain haste until end of turn Choose Your Demise | Duskmourn:

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Similarly, if you sacrifice a creature to activate a mana ability while casting a spell with convoke, that creature won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for convoke

Stitch your eyes, stitch your skin, stitch your mouth into a grin. Illustrated by Riccardo Federici Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp

Then you can flash out a creature to use its ability and trigger that ability at instant speed, such as Eternal Witness, the aforementioned Beast Tracker, or a simple Acidic Slime (which likes Beast Tracker, by the way)

With proactive decks faster than ever wielding redundant threats designed to trade well against removal, while also demanding it fair decks must lean more heavily on strict lock cards to stay alive while maintaining resource efficiency