edhseer Commander synergy, explained
Sorcery
Mana cost: {3}{B}{B}
For each player, choose a creature card in that player's graveyard. Put those cards onto the battlefield under your control. They're black Zombies in addition to their other colors and types and they gain decayed.
on-cast — brings a card back
on-cast — grants a keyword
Causes: put a creature onto the battlefield, a creature leaves a graveyard.
Cares about: a creature in a graveyard.
a creature leaves a graveyard — 1,302 cards in the game can cause this (Ghouls' Night Out is one).
When a creature leaves a graveyard thanks to Ghouls' Night Out:
3 other cards care about it too. These are the ones with the most connections.
anything leaves a graveyard — 2,503 cards in the game can cause this (Ghouls' Night Out is one).
When a creature leaves a graveyard thanks to Ghouls' Night Out:
13 other cards care about it too. These are the ones with the most connections.
a sorcery is cast — 3,720 cards in the game can cause this (Ghouls' Night Out is one).
When Ghouls' Night Out is cast:
424 other cards care about it too. These are the ones with the most connections.
a nontoken creature enters the battlefield — 18,448 cards in the game can cause this (Ghouls' Night Out is one).
When a creature enters thanks to Ghouls' Night Out:
23 other cards care about it too. These are the ones with the most connections.
a creature enters the battlefield — 19,800 cards in the game can cause this (Ghouls' Night Out is one).
298 other cards care about it too. These are the ones with the most connections.
anything enters the battlefield — 26,499 cards in the game can cause this (Ghouls' Night Out is one).
20 other cards care about it too. These are the ones with the most connections.
anything is cast — 31,128 cards in the game can cause this (Ghouls' Night Out is one).
When Ghouls' Night Out is cast:
6 other cards care about it too. These are the ones with the most connections.