Gilder Bairn + Lost Jitte + Elven Chorus

Gilder Bairn

Lost Jitte

Elven Chorus

How it works

1. Activate Elven Chorus by tapping Gilder Bairn, producing its effect.
2. Activate Gilder Bairn by paying 2G/U and untapping it, doubling each counter on Lost Jitte.
3. Activate Lost Jitte two times by removing three charge counters from it, untapping two lands.
4. Activate those lands by tapping them, adding 1G/U.
5. Repeat from step 2.
6. Once you have infinite counters on Lost Jitte, you may instead double the counters on any other permanents.