How it works
Prerequisites
- Skeleton Ship does not have summoning sickness.
- Geralf's Mindcrusher does not have a +1/+1 counter on it.
Steps
- 1Activate Phyrexian Altar by sacrificing Geralf's Mindcrusher, adding one mana of any color.
- 2Geralf's Mindcrusher dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
- 3Geralf's Mindcrusher enters the battlefield, triggering itself and Intruder Alarm.
- 4Resolve the Geralf's Mindcrusher trigger, causing target player to mill five cards.
- 5Resolve the Intruder Alarm trigger, untapping all creatures.
- 6Activate Skeleton Ship by tapping it, putting a -1/-1 counter on Geralf's Mindcrusher.
- 7Repeat.
Commander brackets
In which brackets is this combo allowed, per Spellbook's Exhibition tier?