Experience Counter

Commanders and permanents that gain experience counters on you as a player and grow more powerful as the count climbs. Meren of Clan Nel Toth gains experience when your creatures die and reanimates based on the total, Mizzix of the Izmagnus piles them on as you cast instants and sorceries to slash their costs, Ezuri, Claw of Progress banks experience from small creatures and dumps that many +1/+1 counters onto a creature, and Daxos the Returned and Kalemne, Disciple of Iroas scale tokens and self-buffs the same way. Distinct from Counter Placer, which puts +1/+1 counters on creatures rather than tracking the player-owned experience count, and from Proliferate, which spreads any existing counter kind generically without being tied to the experience mechanic.