Enter the Avatar State (TLA)

Instant — Lesson

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.)

Niche combat trick for white aggro and tempo decks. Enter the Avatar State turns a single creature into an evasive, resilient threat with first strike and lifelink, but the one-time effect and reliance on an existing creature make it a narrow fit compared to permanent pump spells or creature-based threats. Best in limited or casual formats where the flexibility of instant speed and hexproof protection has real value.

Avatar: The Last Airbender — Uncommon