Karn, Silver Golem + Freed from the Real + Doubling Cube

Karn, Silver Golem

Freed from the Real

Doubling Cube

How it works

1. Activate Doubling Cube by paying 3 and tapping it, doubling your unspent mana.
2. Activate Karn by paying 1, causing Doubling Cube to become an artifact creature until end of turn.
3. Cast Freed from the Real by paying 2, enchanting Doubling Cube.
4. Activate Freed from the Real's second ability by paying , untapping Doubling Cube.
5. Activate Doubling Cube by paying 3 and tapping it, doubling your unspent mana.
6. Repeat from step 4.