Gwenna, Eyes of Gaea, Thornbite Staff, Bloodsoaked Champion, and Carrion Feeder

Prerequisites

• Gwenna, Eyes of Gaea on the battlefield
• Thornbite Staff on the battlefield
• Bloodsoaked Champion on the battlefield
• Carrion Feeder on the battlefield
• Thornbite Staff attached to Gwenna
• Gwenna does not have summoning sickness
• A creature has attacked this turn

Steps

1. Activate Carrion Feeder by sacrificing Bloodsoaked Champion
2. Bloodsoaked Champion dies, triggering Gwenna, untapping Gwenna
3. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it
4. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or activate abilities of creatures
5. Activate Bloodsoaked Champion by paying , returning it from your graveyard to the battlefield
6. Repeat

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers