Carnage, Crimson Chaos, Activated Sleeper, and Cackling Counterpart

Prerequisites

• Carnage, Crimson Chaos on the battlefield
• Activated Sleeper in hand or in the graveyard
• Cackling Counterpart in hand
• plus if Activated Sleeper is in your hand available

Steps

1. Cast Cackling Counterpart by paying its mana cost, creating a token copy of Carnage
2. Put the nontoken Carnage into your graveyard due to the legend rule
3. When the Carnage token enters, it triggers, putting Activated Sleeper from your graveyard onto the battlefield, or another applicable card otherwise
4. If Activated Sleeper was not returned in step 3, cast it by paying
5. Regardless, choose to have Activated Sleeper enter as a copy of Carnage
6. Put Activated Sleeper into your graveyard due to the legend rule
7. When Activated Sleeper enters, it triggers, returning itself from your graveyard to the battlefield as a copy of Carnage
8. Repeat from step 5

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers