Knox, the Lightning Protector

Knox, the Lightning Protector enters the battlefield with
{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}
Pay {e}{e}{e} Draw 3 cards, gain 3 life, then destroy target artifact or enchantment.
Pay {e}{e}{e}{e}{e} Put a +3/+3 counter on each creature you control.
Pay {e}{e}{e}{e}{e}{e}{e} You gain 15 life.