Infinitely large creature until end of turn, Infinite mana permanents you control can produce, Infinite untap of creatures you control, Infinite mana creatures you control can produce
Activate Karn by paying , causing Doubling Cube to become an artifact creature until end of turn.
Activate Umbral Mantle's equip ability by paying , attaching it to Doubling Cube.
Float at least in your mana pool.
Activate Doubling Cube by paying and tapping it, adding at least .
Activate Doubling Cube by paying and untapping it, giving it +2/+2 until end of turn.
Repeat from step 4.
Component Cards
How It Works
Activate Karn by paying , causing Doubling Cube to become an artifact creature until end of turn.
Activate Umbral Mantle's equip ability by paying , attaching it to Doubling Cube.
Float at least in your mana pool.
Activate Doubling Cube by paying and tapping it, adding at least .
Activate Doubling Cube by paying and untapping it, giving it +2/+2 until end of turn.
Repeat from step 4.