Ezuri, Claw of Progress is a mythic Legendary Creature — Phyrexian Elf Warrior card from Commander 2015 (C15), collector number 44. Current market price: $2.01, TCGplayer market prices via Scryfall.
Whenever a creature you control with power 2 or less enters, you get an experience counter. At the beginning of combat on your turn, put X +1/+1 counters on another target creature you control, where X is the number of experience counters you have.