Appa, Aang's Companion (TLE 268)

Legendary Creature — Bison Ally • Mana cost: {3}{W} • Avatar: The Last Airbender Eternal • Uncommon

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever Appa attacks, another target attacking creature without flying gains flying until end of turn.

A sky bison is a companion for life.

Illustrated by Kieran Yanner.