Brinelin, the Moon Kraken, Gwenna, Eyes of Gaea, Thrasta, Tempest's Roar, and Sailors' Bane

Prerequisites

• Brinelin, the Moon Kraken on the battlefield
• Gwenna, Eyes of Gaea on the battlefield
• Thrasta, Tempest's Roar on the battlefield
• Sailors' Bane in hand
• Gwenna does not have summoning sickness
• You have cast at least three spells this turn
• You have at least seven cards in your graveyard and/or exile that's an instant or sorcery, or that has an Adeventure

Steps

1. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or to activate abilities of creatures
2. Cast Sailors' Bane by paying
3. Brinelin and Gwenna trigger
4. Resolve the Brinelin trigger, returning Thrasta from the battlefield to your hand
5. Resolve the Gwenna trigger, putting a +1/+1 counter on it and untapping it
6. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or to activate abilities of creatures
7. Cast Thrasta by paying
8. Brinelin and Gwenna trigger
9. Resolve the Brinelin trigger, returning Sailors' Bane from the battlefield to your hand
10. Resolve the Gwenna trigger, putting a +1/+1 counter on it and untapping it
11. Repeat

Results

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