Intruder Alarm + Maskwood Nexus + Cyberdrive Awakener

Intruder Alarm

Maskwood Nexus

Cyberdrive Awakener

How it works

1. Cast Cyberdrive Awakener by paying 5.
2. When Cyberdrive Awakener enters the battlefield, it triggers, causing Maskwood Nexus to become an artifact creature until end of turn.
3. Activate any number of mana-producing creatures you control by tapping them, adding at least 3.
4. Activate Maskwood Nexus by paying 3 and tapping it, creating a 2/2 Shapeshifter creature token.
5. When the Shapeshifter enters the battlefield, Intruder Alarm triggers, untapping all creatures.
6. Repeat from step 3.
7. If creatures you control can tap to produce at least 4, this combo nets infinite mana.