Intruder Alarm + Maskwood Nexus + Mishra, Eminent One

Intruder Alarm

Maskwood Nexus

Mishra, Eminent One

How it works

1. At the beginning of your combat phase, Mishra triggers, creating a token copy of Maskwood Nexus that is a 4/4 Construct with haste named Mishra's Warform.
2. When Mishra's Warform enters the battlefield, Intruder Alarm triggers, untapping all creatures.
3. Activate any number of mana-producing creatures you control by tapping them, adding at least 3.
4. Activate Mishra's Warform 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.