Skeleton Ship
Intruder Alarm
Geralf's Messenger
Phyrexian Altar

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Skeleton Ship does not have summoning sickness. Geralf's Messenger does not have any +1/+1 counters.

   Steps

How does this combo work?
1
Activate Phyrexian Altar by sacrificing Geralf's Messenger, adding one mana of any color.
2
Geralf's Messenger dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3
Geralf's Messenger enters the battlefield, triggering itself and Intruder Alarm.
4
Resolve the Geralf's Messenger trigger, causing an opponent to lose 2 life.
5
Resolve the Intruder Alarm trigger, untapping all creatures.
6
Activate Skeleton Ship by tapping it, putting a -1/-1 counter on Geralf's Messenger.
7
Repeat.

   Results

What do I get from this combo?
Infinite colored mana
Infinite death triggers
Infinite ETB
Infinite lifeloss
Infinite LTB
Infinite mana creatures you control can produce
Infinite sacrifice triggers
Infinite untap of creatures
Infinite untap of creatures you control
Marneus Calgar
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