Worldgorger Dragon + Molten Echoes

Worldgorger Dragon

Molten Echoes

How it works

1. Cast Worldgorger Dragon, triggering Molten Echoes and Worldgorger Dragon's ETBs; stack the triggers to resolve in that order.
2. Resolve Molten Echoes' trigger, creating a token copy of Worldgorger Dragon and triggering its ETB.
3. Float as much mana as you want in response to the token's ETB trigger.
4. The token's effect resolves, exiling everything else you control, including the original Worldgorger Dragon.
5. Resolve the original Worldgorger Dragon's LTB with no effect, then resolve the ETB trigger of the original Worldgorger Dragon, exiling the token copy.
6. Resolve token Worldgorger Dragon's LTB trigger, returning everything it exiled to the battlefield under your control.
7. Name Dragons as Molten Echoes enters the battlefield.
8. Repeat the loop from the top for infinite mana.
9. Repeat this process until you have infinite mana.
10. The loop can broken by naming a different creature type as Molten Echoes enters the battlefield.