Pelt Collector is a rare Creature — Elf Warrior card from Guilds of Ravnica Promos (PGRN), collector number 141p. Current market price: $1.40 (foil $2.94), TCGplayer market prices via Scryfall.
Whenever another creature you control enters or dies, if that creature's power is greater than this creature's, put a +1/+1 counter on this creature. As long as this creature has three or more +1/+1 counters on it, it has trample.