Omnath, Locus of Creation

When Omnath, Locus of Creation enters, draw a card.
Landfall — Whenever a land you control enters,
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.