Niv-Mizzet, the Firemind +Tandem Lookout +

Infinite draw Infinite damage Revised by CR

Pair Tandem Lookout with Niv-Mizzet Tap Niv-Mizzet to draw a card, its ability will trigger, dealing 1 damage to the opponent. Tandem Lookout's ability will trigger, drawing a card. Niv-Mizzet's ability will trigger, dealing 1 damage to the opponent the process will be repeated in a loop until the opponent reaches 0 life or you have no more cards to draw.

Legallity