Halo Fountain + Aphetto Alchemist + Phyrexian Altar

Halo Fountain

Aphetto Alchemist

Phyrexian Altar

How it works

1. Activate Aphetto Alchemist by tapping it, targeting Halo Fountain.
2. Holding priority, activate Halo Fountain's first ability by paying , tapping it and untapping Aphetto Alchemist, creating a 1/1 Citizen creature token.
3. Resolve the Aphetto Alchemist ability, untapping Halo Fountain.
4. Activate Phyrexian Altar by sacrificing the Citizen token, adding .
5. Repeat.