Brinelin, the Moon Kraken, Earthquake Dragon, Gwenna, Eyes of Gaea, and Sailors' Bane

Prerequisites

• Brinelin, the Moon Kraken on the battlefield
• Earthquake Dragon on the battlefield
• Gwenna, Eyes of Gaea on the battlefield
• Sailors' Bane in hand
• Gwenna does not have summoning sickness
• You have at least seven cards in your graveyard and/or exile that's an instant or sorcery, or that has an Adeventure
• Dragons you control have a total mana value of five or greater

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 Earthquake Dragon 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 and one mana of any color that can only be spent to cast creature spells or to activate abilities of creatures
7. Cast Earthquake Dragon 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 colored mana that can only be spent to activate abilities of creatures
• Infinite colored mana that can only be spent to cast creature spells
• Infinite ETB
• Infinite LTB
• Infinite storm count