Mister Gutsy, Nim Deathmantle, Krark-Clan Ironworks, and First Day of Class

Prerequisites

• Mister Gutsy on the battlefield
• Nim Deathmantle on the battlefield
• Krark-Clan Ironworks on the battlefield
• First Day of Class in hand
• plus if Mister Gutsy doesn't have a +1/+1 counter on it available

Steps

1. Cast First Day of Class by paying
2. Activate Krark-Clan Ironworks by sacrificing Mister Gutsy, adding
3. When Mister Gutsy dies, its second ability and Nim Deathmantle trigger
4. Resolve the Mister Gutsy trigger, creating a number of Junk tokens equal to the number of +1/+1 counters that were on it
5. If you created a Junk token, activate Krark-Clan Ironworks by sacrificing a Junk, adding
6. Resolve the Nim Deathmantle trigger, causing you to pay to return Mister Gutsy from your graveyard to the battlefield, and attaching Nim Deathmantle to it
7. When Mister Gutsy enters the battlefield, First Day of Class triggers, putting a +1/+1 counter on Mister Gutsy
8. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers