Brinelin, the Moon Kraken + Gwenna, Eyes of Gaea + Primeval Protector + Sailors' Bane

Brinelin, the Moon Kraken

Gwenna, Eyes of Gaea

Primeval Protector

Sailors' Bane

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 Primeval Protector by paying at most 1.
3. Brinelin and Gwenna trigger.
4. Resolve the Brinelin trigger, returning Sailors' Bane from the battlefield to your hand.
5. Resolve the Gwenna trigger, putting a +1/+1 counter on it and untapping it.
6. When Primeval Protector enters, it triggers, putting a +1/+1 counter on each other creature you control.
7. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or to activate abilities of creatures.
8. Cast Sailors' Bane by paying .
9. Brinelin and Gwenna trigger.
10. Resolve the Brinelin trigger, returning Primeval Protector from the battlefield to your hand.
11. Resolve the Gwenna trigger, putting a +1/+1 counter on it and untapping it.
12. Repeat.

This loop uses Gwenna, Eyes of Gaea as a mana engine that continuously untaps itself by leveraging its own ability to cast giant creatures. By casting Primeval Protector and Sailors' Bane alternately, you trigger Brinelin, the Moon Kraken's ability to bounce the opposite giant back to your hand each time, ensuring you always have a cheap, high-mana-value spell ready to replay. As this cycle repeats, Gwenna grows larger with every iteration while continually refunding restricted mana, allowing Primeval Protector to pump your entire board with infinite +1/+1 counters.