Adarkar Valkyrie
Intruder Alarm
Altar of Dementia

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Adarkar Valkyrie does not have summoning sickness. You control at least one additional nontoken creature.

   Steps

How does this combo work?
1
Activate Adarkar Valkyrie by tapping it, targeting another nontoken creature you control.
2
Activate Altar of Dementia by sacrificing the creature targeted in step 1.
3
When the creature dies, Adarkar Valkyrie triggers, returning the sacrificed creature from your graveyard to the battlefield.
4
When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
5
Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
6
Repeat.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite mill
Infinite self-mill
Infinite mana creatures you control can produce
Infinite untap of all creatures
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