Meren of Clan Nel Toth

The experience counter is the mechanic that makes this work, and it solves a recurring problem with graveyard commanders: how do you scale recursion without breaking it early? The counters never reset and never decline, so the engine grows with the game rather than with your mana. Early on, the end-step trigger hands back a sacrificed one-drop; ten dead creatures later, it slings five- and six-drops straight onto the battlefield. The fail case is the design discipline here: a card whose mana value exceeds your counter total still returns to hand rather than whiffing, so the trigger is never wasted, only deferred. That guarantees a stocked graveyard turns every end step into either a reanimation or a recursion.

Crucially, the counter only ticks when another creature you control dies: her own death gives nothing, and neither does an opponent's board getting wiped. That restriction fences the payoff into a dedicated sacrifice shell rather than rewarding board-wide carnage. Every creature you feed to a sacrifice outlet becomes a counter, every counter raises the reanimation ceiling, and the outlet closes the circuit by converting your own bodies into both currency and fodder for the next loop. The structure rewards creatures that want to die and come back, which makes this less a value piece than the literal engine block of a black-green attrition deck. It charges experience where most reanimation charges mana per body: a currency you can only accumulate by playing the game it wants you to play.