Avatar, the Last Aibender

When Omnath, Locus of Creation 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, Omnath deals 4 damage to
each opponent and each planeswalker you don't
control.