Protium, Arcanic Traveler

: Whenever an opponent casts a spell during your turn, counter it unless they pay two mana of any color and you draw a card.
+1: Draw a card, then you may exile target creature or planeswalker with converted mana cost less than or equal to the number of cards in your hand.
-8: Draw cards equal to the number of permanents on the battlefield, then gain life equal to the number of cards in your hand.