Yannik, Scavenging Sentinel, Fiend Hunter, and Changeling Hero

Prerequisites

• Yannik, Scavenging Sentinel in hand or in the command zone
• Fiend Hunter in hand
• Changeling Hero on the battlefield
• plus enough mana to pay for commander tax, if applicable available

Steps

1. Cast Yannik by paying and commander tax, if applicable
2. Yannik enters the battlefield, exiling Changeling Hero and distributing a number of +1/+1 counters equal to Changeling Hero's power among creatures you control
3. The creature that was championed by Changeling Hero returns to the battlefield from exile
4. Cast Fiend Hunter by paying
5. Fiend Hunter enters the battlefield, exiling Yannik
6. Changeling Hero returns to the battlefield from exile, championing Fiend Hunter
7. Fiend Hunter leaves the battlefield, returning Yannik to the battlefield from exile
8. Yannik enters the battlefield, exiling Changeling Hero and distributing a number of +1/+1 counters equal to Changeling Hero's power among creatures you control
9. Changeling Hero leaves the battlefield, returning Fiend Hunter to the battlefield from exile
10. Repeat from step 5

Results

• Infinite +1/+1 counters on all other creatures you control
• Infinite ETB
• Infinite LTB