edhseer Commander synergy, explained
Instant
Mana cost: {R}{R}
Copy target instant or sorcery spell you control. If this spell was cast from a graveyard, copy that spell twice instead. You may choose new targets for the copies.
on-cast — copies a spell
on-cast — copies a spell
Flashback {3}{R}{R}
Causes: copy an instant, copy a sorcery, copy a spell.
Cares about: nothing.
a sorcery is copied — 83 cards in the game can cause this (Increasing Vengeance is one).
When Increasing Vengeance is copied:
21 other cards care about it too. These are the ones with the most connections.
an instant is copied — 87 cards in the game can cause this (Increasing Vengeance is one).
31 other cards care about it too. These are the ones with the most connections.
a spell is copied — 122 cards in the game can cause this (Increasing Vengeance is one).
When Increasing Vengeance is copied:
1 other card cares about it too. These are the ones with the most connections.
an instant is cast — 3,931 cards in the game can cause this (Increasing Vengeance is one).
When Increasing Vengeance is cast:
427 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 (Increasing Vengeance is one).
When Increasing Vengeance is cast:
5 other cards care about it too. These are the ones with the most connections.