Gilder Bairn + Karametra's Favor + Iceberg

Gilder Bairn

Karametra's Favor

Iceberg

How it works

1. Activate Gilder Bairn using its ability from Karametra's Favor by tapping it, adding one mana.
2. Activate Gilder Bairn by paying 2G/U and untapping it, doubling each counter on Iceberg.
3. Activate Iceberg 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 Iceberg, you may instead double the counters on any other permanents.