Gwenna, Eyes of Gaea + Temur Sabertooth + Phyrexian Dreadnought + Zirda, the Dawnwaker

Gwenna, Eyes of Gaea

Temur Sabertooth

Phyrexian Dreadnought

Zirda, the Dawnwaker

How it works

1. Activate Gwenna by tapping it, adding 1 that can only be spent to cast creature spells or activate abilities of creatures.
2. Cast Phyrexian Dreadnought by paying 1.
3. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
4. Phyrexian Dreadnought enters the battlefield, triggering itself.
5. Holding priority, activate Temur Sabertooth by paying , returning Phyrexian Dreadnought from the battlefield to your hand.
6. Resolve the Phyrexian Dreadnought ability, failing to sacrifice it due to it no longer being on the battlefield.
7. Repeat.