Sage of Hours is a mythic Creature — Human Wizard card from Secret Lair Drop (SLD), collector number 2868. Current market price: $10.34 (foil $15.23), 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.