Enter the Avatar State (TLA 18)

Instant — Lesson • Mana cost: {W} • Avatar: The Last Airbender • Uncommon

Until end of turn, target creature you control becomes an Avatar in addition to its other types and gains flying, first strike, lifelink, and hexproof. (A creature with hexproof can't be the target of spells or abilities your opponents control.)

"The glow is the combination of all your past lives, focusing their energy through your body."
—Avatar Roku

Illustrated by Shiren.