Pili-Pala + Dual Casting + Seething Song

Pili-Pala

Dual Casting

Seething Song

How it works

1. Cast Seething Song by paying its mana cost.
2. Holding priority, activate Pili-Pala by paying and tapping it, copying Seething Song.
3. Resolve the copy of Seething Song, adding .
4. Activate Pili-Pala by paying 2 and untapping it, adding one mana of any color.
5. Repeat from step 2.