Toxrill, the Corrosive, and Maha, Its Feathers Night

Prerequisites

• Toxrill, the Corrosive on the battlefield
• Maha, Its Feathers Night on the battlefield

Steps

1. At the beginning of your end step, Toxrill's first ability triggers, putting a slime counter on each creature your opponents control
2. Because your opponents' creatures are now 0/0 due to Maha and Toxrill's static effects, the creatures die as a state-based action due to having zero toughness unless there is an effect boosting their toughness
3. Repeat during each of your end steps

Results

• Reduce each opposing creature's toughness to zero during each of your end steps