Gilder Bairn + Workhorse + Karametra's Favor

Gilder Bairn

Workhorse

Karametra's Favor

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 Workhorse.
3. Activate Workhorse 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 Workhorse, you may instead double the counters on any other permanents.