Karrthus, Tyrant of Jund, and Splinter Twin

Prerequisites

• Karrthus, Tyrant of Jund on the battlefield
• Splinter Twin on the battlefield
• Splinter Twin attached to Karrthus

Steps

1. Activate Karrthus, putting a token copy of Karrthus onto the battlefield
2. The token copy is put into your graveyard due to the legend rule
3. The token copy's enter the battlefield ability triggers, untapping all dragons you control
4. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB