Arthur, the Ascended

Whenever you draw a card, target opponent loses 2 life.
Whenever a land enters de batttlefield, you gain 2 life.
Whenever a nontoken creature enters the battlefield
under your control, create a 2/2 cosmic dust elemental creature.
Whenever an nontoken artifact comes into play, create a tapped treasure token.
Whenever an enchantement comes into play,
scry 1 then draw a card.