Madame Hydra, Reanimated

Two abilities pull the same lever, and the self-feeding loop that results defines this build-around: every entry and every attack pushes two more cards into the yard, while the base 2/2 grows by one for each creature card that lands there. Menace is what converts the growth into damage instead of a bigger wall; a body that gets harder to gang-block as it swells punishes opponents for letting the graveyard fill. The mill keyword here targets your own library, so it functions as a fuel line rather than a clock, and a shell stuffed with creatures over spells makes the toughness climb faster and the menace math turn lethal sooner. That same self-mill dovetails with any reanimation package it sits beside, turning creatures binned during the growth from a liability into both a stat boost and a pool of recursion targets. Graveyard-matters attackers usually face a split between the setup turn that stocks the yard and the turn that attacks with the count; tying the mill to both entering and attacking collapses those into one action, so the creature growing your graveyard is the same creature swinging with its size.