Jötun Owl Keeper is a uncommon Creature — Giant card from The List (PLST), collector number CSP-9. Current market price: $0.06, TCGplayer market prices via Scryfall.
Cumulative upkeep {W} or {U} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When this creature dies, create a 1/1 white Bird creature token with flying for each age counter on it.