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.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

At the beginning of each end step, if Inferno Hellion attacked or blocked this turn, its owner shuffles it into their library.