Kaya the Inexorable + Pitiless Plunderer + Felidar Guardian + Heartless Summoning + Phyrexian Altar

Kaya the Inexorable

Pitiless Plunderer

Felidar Guardian

Heartless Summoning

Phyrexian Altar

How it works

1. Activate Kaya's +1 loyalty ability to put a Ghostform Counter on Felidar Guardian.
2. Sacrifice Felidar Guardian to Phyrexian Altar to add one mana of any color.
3. Felidar Guardian is returned to your hand, and you create a 1/1 Spirit creature token.
4. Pitiless Plunderer triggers, creating a Treasure token.
5. Sacrifice the Treasure token for .
6. The Spirit dies to having 0 toughness.
7. Pitiless Plunderer triggers, creating a Treasure token.
8. Sacrifice the Treasure token for 1.
9. Cast Felidar Guardian for 1.
10. When Felidar Guardian enters the battlefield, exile Kaya and return her to the battlefield.
11. Repeat.