Mister Fantastic, Dynaheir, Invoker Adept, and Fatestitcher

Prerequisites

• Mister Fantastic on the battlefield
• Dynaheir, Invoker Adept on the battlefield
• Fatestitcher on the battlefield
• available

Steps

1. Put any triggered ability on the stack
2. Holding priority, activate Dynaheir by tapping it
3. Activate Mister Fantastic by paying and tapping it, targeting the ability from step 1
4. Dynaheir triggers
5. Holding priority, activate Fatestitcher by tapping it, untapping Mister Fantastic
6. Activate Mister Fantastic by paying and tapping it, copying Dynaheir's trigger twice Resolve the first copy of Dynaheir's trigger, copying Mister Fantastic's ability, targeting Dynaheir's trigger Resolve the copy of Mister Fantastic's ability, copying Dynaheir's trigger twice
7. Repeat from step 6

Results

• Infinite copies of triggered abilities you control on the stack