Gilder Bairn + Pentad Prism + Paradise Mantle

Gilder Bairn

Pentad Prism

Paradise Mantle

How it works

1. Activate Gilder Bairn using its ability from Paradise Mantle by tapping it, adding one mana.
2. Activate Gilder Bairn by paying 2G/U and untapping it, doubling each counter on Pentad Prism.
3. Activate Pentad Prism as many times as necessary by removing counters from it, adding at least two mana.
4. Repeat from step 2.
5. Once you have infinite counters on Pentad Prism, you may instead double the counters on any other permanents.