Forgotten Ancient is a rare Creature — Elemental card from Commander 2015 (C15), collector number 185. Current market price: $0.47, TCGplayer market prices via Scryfall.
Whenever a player casts a spell, you may put a +1/+1 counter on this creature. At the beginning of your upkeep, you may move any number of +1/+1 counters from this creature onto other creatures.