Omnath, The Omnipotent

When Omnath, The Omnipotent enters the battlefield, you draw a card and each opponent discards two cards.
Landfall—Whenever a land enters the battlefield
under your control, you gain 5 life if this is the
first time this ability has resolved this turn. If it's
the second time, add {r}{g}{w}{u}{b}. If it's the third
time, Omnath deals 5 damage to each opponent,
creature, and each planeswalker you don't control.