Halo Fountain + Intruder Alarm + Karn, Silver Golem
Halo Fountain
Intruder Alarm
Karn, Silver Golem
Requires
Halo Fountain must be on the battlefield.
Intruder Alarm must be on the battlefield.
Karn, Silver Golem must be on the battlefield.
Halo Fountain does not have summoning sickness.
You control a creature that can tap to produce at least .
Mana needed: 
Steps
- Activate Karn by paying , causing Halo Fountain to become an artifact creature until end of turn.
- Activate a creature you control by tapping it, adding .
- Activate Halo Fountain's first ability by paying , tapping and untapping it, creating a 1/1 Citizen creature token.
- When the Citizen enters the battlefield, Intruder Alarm triggers, untapping all creatures.
- Repeat from step 2.
Results
Infinite creature tokens. Infinite ETB. Infinite mana creatures you control can produce. Infinite untap of creatures.
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