Curious Colossus is a mythic Creature — Giant Warrior card from Lorwyn Eclipsed Promos (PECL), collector number 12p. Current market price: $3.58 (foil $4.89), 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.