Chromium, the Mutable{4}{W}{U}{B}
Legendary Creature — Elder Dragon
Flash
This spell can't be countered.
Flying
Discard a card: Until end of turn, Chromium, the Mutable becomes a Human with base power and toughness 1/1, loses all abilities, and gains hexproof. It can't be blocked this turn.
7/7
Artista: Chase Stone