MTG >Combos >Altar of the Brood +Sedraxis Alchemist +Rooftop Storm +

In order:

1. Cast

Altar of the Brood

2. Cast

Rooftop Storm

.

Altar of the Brood

triggers 3. Cast

Sedraxis Alchemist

for zero mana, thanks to the ability of

Rooftop Storm

.

Altar of the Brood

triggers 4. Use the

Sedraxis Alchemist

's ability to return itself to your hand 5. Repeat the process to mill infinite cards