Gilded Lotus + Umbral Mantle + Karn's Touch

Gilded Lotus

Umbral Mantle

Karn's Touch

How it works

1. Cast Karn's Touch by paying , targeting Gilded Lotus.
2. Activate Umbral Mantle's equip ability by paying 0, attaching it to the Gilded Lotus.
3. Activate Gilded Lotus by tapping it, adding three mana of any one color.
4. Activate Umbral Mantle by paying 3 and untapping it, giving itself +2/+2 until end of turn.
5. Repeat.