Sage of Hours is a mythic Creature — Human Wizard card from Journey into Nyx (JOU), collector number 50. Current market price: $11.79 (foil $58.55), TCGplayer market prices via Scryfall.
Heroic — Whenever you cast a spell that targets this creature, put a +1/+1 counter on it. Remove all +1/+1 counters from this creature: For each five counters removed this way, take an extra turn after this one.