Arbeth, Harbinger of War

Flying, first strike
When Arbeth, Harbinger of War enters the battlefield exile the top three cards of each player's library. Arbeth gets +1/+1 for each card exiled this way.
Pay 2 life: Until end of turn, you may cast cards exiled by Arbeth and you may spend mana as though it were mana of any color to cast
them.