Blowfly Infestation + Hapatra, Vizier of Poisons

Prerequisites

• You control at least two other creatures with toughness equal to one.
• You have a way to put a -1/-1 counter on a creature.

Steps

1. 1Put a -1/-1 counter on any creature you control with toughness equal to one.
2. 2The creatue dies as a state-based action due to having zero toughness.
3. 3Hapatra and Blowfly Infestation trigger.
4. 4Resolve the Hapatra trigger, creating a 1/1 Snake creature token.
5. 5Resolve the Blowfly Infestation trigger, putting a -1/-1 counter on any creature you control with toughness equal to one.
6. 6Repeat from step 2.

Effects

• Infinite death triggers
• Infinite ETB
• Infinite LTB