Molten Echoes, and Felidar Guardian

Prerequisites

• Molten Echoes on the battlefield
• Felidar Guardian in hand
• "Cat" or "Beast" chosen with Molten Echoes
• available

Steps

1. Cast Felidar Guardian
2. On ETB, both Felidar Guardian and Molten Echoes trigger; resolve the triggers in that order
3. Target a land that ETBs untapped with Felidar Guardian, floating mana and blinking it
4. Resolve Molten Echoes' trigger, creating a Felidar Guardian token copy
5. Blink the original Felidar Guardian with the token's ETB Blink trigger
6. The original Felidar Guardian ETBs, repeating the loop from the top for infinite mana and infinite hasty cat tokens

Results

• Infinite colored mana
• Infinite creatures tokens with haste
• Infinite ETB
• Infinite LTB