Seer of the Bright Side is a rare Creature — Human Assassin card from Unknown Event (UNK), collector number RB02. Current market price: $4.99, TCGplayer market prices via Scryfall.
This creature enters with two cage counters on it. This creature can't attack or block as long as it has a cage counter on it. At the beginning of your upkeep, remove a cage counter from this creature. When the last cage counter is removed this way, destroy target creature an opponent controls.