Brinelin, the Moon Kraken + Gwenna, Eyes of Gaea + Ghalta, Primal Hunger + Thrasta, Tempest's Roar

Brinelin, the Moon Kraken

Gwenna, Eyes of Gaea

Ghalta, Primal Hunger

Thrasta, Tempest's Roar

How it works

1. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or to activate abilities of creatures.
2. Cast Ghalta 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 Ghalta from the battlefield to your hand.
10. Resolve the Gwenna trigger, putting a +1/+1 counter on it and untapping it.
11. Repeat.