Appa, Aang's Companion is a rare Legendary Creature — Bison Ally card from Magic: The Gathering (Media and Collaboration Promos, PMEI).
Rare
Media and Collaboration Promos (PMEI)
{3}{W}
Power / Toughness
2 / 4
Mana Value
4
Colors
W
Card Text
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.
