Norman Osborn can't be blocked.

Whenever Norman Osborn deals combat damage to a player, he connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)

{1}{U}{B}{R}: Transform Norman Osborn. Activate only as a sorcery.

Green Goblin

Flying, menace

Spells you cast from your graveyard cost 2 less to cast.

Goblin Formula — Each nonland card in your graveyard has mayhem. The mayhem cost is equal to its mana cost. (You may cast a card from your graveyard for its mayhem cost if you discarded it this turn. Timing rules still apply.)