Norman Osborn // Green Goblin + Hullbreaker Horror + Prognostic Sphinx

Prerequisites

You have a nonland permanent card in hand that costs {2} or less. You control a nontoken nonland permanent that costs {2} or less.

Steps

1. Activate Prognostic Sphinx by discarding a nonland permanent card that costs {2} or less.
2. Cast the permanent from your graveyard for its mayhem cost by paying {0} due to Green Goblin.
3. Hullbreaker Horror trigger, returning another nonland permaennt that costs 2 or less from the battlefield to your hand.
4. Resolve the spell from step 2.
5. Repeat.