Skraag, Moon Eater

Flying
When Skraag enters the battlefield, draw a card.
Whenever you play a land,
you gain two life and draw a card.
Whenever you tap a land, you may lose 2 life.
If you do, untap target land.
Pay X blue mana: do X damage to any target.
{u/r}{u/r}{u/r}{t}: Activate all abilities that say
"When this creature enters the battlefield...".