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Derevi, Empyrial Tactician While Derevi, Empyrial Tactician is best known in cEDH circles for its Stax builds (and as someone who has had their resources completely choked out multiple times this way, its reputation is well deserved ), the ability to tap or untap a permanent when it enters the battlefield also offers a lot of opportunities for abuse
Grim Lavamancer I hadn't realized quite how many of the dorks around the time of Lavamancer have fallen off
Rabbit Merlin lets you draw a card when it enters and leaves while crab Merlin gives Challenger to another character
The Slumlord creates a black rat token with its passive ability when a non-token creature dies and gives all rats deathtouch
Advent of the Wurm Ancestral Anger Angelfire Ignition Appeal // Authority Awaken the Bear Barge In Barreling Attack Beast Mode Become Brutes Berserk Bestow Greatness Biosynthic Burst Blind Fury Blitzball Shot Brute Strength Built to Smash Bull's Strength Cabaretti Charm Charge Through Chorus of Might Collision // Colossus Colossal Growth Colossal Might Confidence from Strength Crash Through Crash the Ramparts Crashing Footfalls Curse of the Werefox Dinosaur Stampede Distemper of the Blood Dreadmaw's Ire Driven // Despair Duelist's Flame Efflorescence Elemental Appeal Engineered Might Enlarge Enthusiastic Study Fanatical Fever Fanatical Strength Fatal Frenzy Fire Giant's Fury Fistful of Force Fists of Flame Force of Rage Forth Eorlingas