Avatar Aang

When Avatar Aang enters the battlefield, draw a
card.
Landfall - Whenever a land enters the battlefield
under your control, you gain 4 life if this is the
first time this ability has resolved this turn. If it's
the second time, add {r}{g}{w}{u}. If it's the third
time, Avatar Aang deals 4 damage to each
opponent and each planeswalker you don't
control.