mtg prosper tome bound commander deck EDH Prosper, Tome-Bound Custom Art Blue Core Proxy & Token Foils Legendary Creature Tiefling Warlock Planar Portal MTG Commander Precon

For two black mana and X mana, you give all creatures -X/-X until the end of turn

But even better than that, it also doubles triggers from your birds or your lands

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Through the Ages will very likely, and at long last, bring partner pairings into the Arena format thanks to Bruse Tarl, Boorish Herder, reimagined as Final Fantasy XVI's Hugo Kupka (who is not really one of the good guys, as you may guess from the card art), and Tymna the Weaver as Cecil Harvey, illustrated by the legendary Yoshitaka Amano

If the creature with mentor leaves the battlefield with the mentor ability on the stack, use its power as that creature last existed on the battlefield to determine whether the target creature has lesser power