Intruder Alarm
Maskwood Nexus
Myr Welder

   Prerequisites

What do I need to start this combo?
Maskwood Nexus in exile (Maskwood Nexus exiled by Myr Welder in exile).
Intruder Alarm and Myr Welder on the battlefield.
Creatures you control can tap to produce at least 3.

   Steps

How does this combo work?
1
Activate any number of mana-producing creatures you control by tapping them, adding at least 3.
2
Activate Myr Welder using Maskwood Nexus's ability by paying 3 and tapping it, creating a 2/2 Shapeshifter creature token.
3
When the Shapeshifter enters the battlefield, Intruder Alarm triggers, untapping all creatures.
4
Repeat from step 2.
5
If creatures you control can tap to produce at least 4, this combo nets infinite mana.

   Results

What do I get from this combo?
Infinite ETB
Infinite creature tokens
Infinite untap of creatures
Infinite mana creatures you control can produce
Infinite untap of creatures you control
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