Altered Ego is a rare Creature — Shapeshifter card from Innistrad Remastered (INR), collector number 228. Current market price: $0.30 (foil $0.40), TCGplayer market prices via Scryfall.
This spell can't be countered. You may have this creature enter as a copy of any creature on the battlefield, except it enters with X additional +1/+1 counters on it.