Curious Colossus is a mythic Creature — Giant Warrior card from Lorwyn Eclipsed (ECL), collector number 298. Current market price: $1.62 (foil $3.21), TCGplayer market prices via Scryfall.
When this creature enters, each creature target opponent controls loses all abilities, becomes a Coward in addition to its other types, and has base power and toughness 1/1.