edhseer Commander synergy, explained
Sorcery
Mana cost: {2}{B}{B}
Create two tapped 2/2 black Horror creature tokens. If this spell was cast from a graveyard, instead create X of those tokens, where X is the number of creature cards in your graveyard.
on-cast — makes 2 tokens
on-cast — makes X tokens
Flashback {4}{B}{B}
Causes: create a Horror creature token, put a Horror creature token onto the battlefield.
Cares about: a creature in a graveyard.
a creature in a graveyard — 2,769 cards in the game can cause this (The Final Days is one).
2,759 other cards care about it too. These are the ones with the most connections.
a creature token enters the battlefield — 2,799 cards in the game can cause this (The Final Days is one).
When a Horror enters thanks to The Final Days:
a creature token is created — 2,799 cards in the game can cause this (The Final Days is one).
3 other cards care about it too. These are the ones with the most connections.
a token enters the battlefield — 3,710 cards in the game can cause this (The Final Days is one).
When a Horror enters thanks to The Final Days:
3 other cards care about it too. These are the ones with the most connections.
a token is created — 3,711 cards in the game can cause this (The Final Days is one).
When The Final Days makes a Horror token:
17 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 (The Final Days is one).
When The Final Days is cast:
424 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 (The Final Days is one).
When a Horror enters thanks to The Final Days:
327 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 (The Final Days is one).
When a Horror enters thanks to The Final Days:
34 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 (The Final Days is one).
When The Final Days is cast:
5 other cards care about it too. These are the ones with the most connections.