Pikachu

Level up {w}{w}: Put a level counter on this.
(Level up only as a sorcery.)
Level 1-2 — [2/2] Vigilance
Level 3+ — [3/ 3] Vigilance
Whenever you gain life, put a +1/+1 counter on Pikachu.
Iron Tail
{2}{w}, {t}: Tap target creature an opponent
controls.You gain 1 life.