Oof

When Oof enters the battlefield, say "go commit not alive"
If you do, you gain 3 life and your opponent loses 3 life.
When Oof enters the battlefield,
it gets a +1/+1 counter for each {w} you paid in its mana cost,
you gain 1 life for every {g} you paid in Oof's mana cost,
and you draw a card for each {u} you paid in Oof's mana cost.
Hexproof, haste