Squall, SeeD Mercenary, The Peregrine Dynamo, and Krark-Clan Ironworks

Prerequisites

• Squall, SeeD Mercenary on the battlefield
• The Peregrine Dynamo on the battlefield
• Krark-Clan Ironworks on the battlefield
• available

Steps

1. Deal combat damage to an opponent using Squall, triggering its second ability
2. Holding priority, activate The Peregrine Dynamo by paying and tapping it, targeting Squall's ability
3. Holding priority, activate Krark-Clan Ironworks by sacrificing The Peregrine Dynamo, adding
4. Resolve the Peregrine Dynamo ability, copying Squall's trigger, with the new trigger targeting The Peregrine Dynamo
5. Resolve the copy of Squall's trigger, returning The Peregrine Dynamo from your graveyard to the battlefield
6. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana