Arcanis the Omnipotent + Tolarian Kraken + Nantuko Elder

Arcanis the Omnipotent

Tolarian Kraken

Nantuko Elder

How it works

1. Activate Nantuko Elder by tapping it, adding C.
2. Activate Arcanis's first ability by tapping it, causing you to draw three cards.
3. Tolarian Kraken triggers three times. Resolve the first two triggers, causing you to pay 2 to untap Arcanis and Nantuko Elder.
4. Resolve the last Tolarian Kraken trigger, choosing not to pay.
5. Repeat.