Omnath, Locus of Creation

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.