Henzie "Toolbox" Torre, Gwenna, Eyes of Gaea, and Sparkcaster

Prerequisites

• Henzie "Toolbox" Torre on the battlefield
• Gwenna, Eyes of Gaea on the battlefield
• Sparkcaster in hand
• You have cast your commander from the command zone at least twice
• Gwenna does not have summoning sickness

Steps

1. Activate Gwenna by tapping it, adding
2. Cast Sparkcaster for its blitz cost by paying
3. Gwenna triggers, putting a +1/+1 counter on it and untapping it
4. When Sparkcaster enters the battlefield, its first and second abilities trigger
5. Resolve the first trigger, returning Sparkcaster from the battlefield to your hand
6. Resolve the second triggers, dealing 1 damage to any player or planeswalker
7. Repeat

Results

• Infinite +1/+1 counters on Gwenna
• Infinite damage
• Infinite ETB
• Infinite LTB
• Infinite storm count