edhseer Commander synergy, explained
Instant
Mana cost: {1}{B}{B}
Destroy target creature or planeswalker.
on-cast —
Causes: a creature dies, a planeswalker is put into a graveyard from the battlefield.
Cares about: nothing.
a planeswalker in a graveyard — 232 cards in the game can cause this (Hero's Downfall is one).
Hero's Downfall puts cards into the graveyard that:
66 other cards care about it too. These are the ones with the most connections.
a creature in a graveyard — 2,769 cards in the game can cause this (Hero's Downfall is one).
Hero's Downfall puts cards into the graveyard that:
799 other cards care about it too. These are the ones with the most connections.
a nontoken creature dies — 2,769 cards in the game can cause this (Hero's Downfall is one).
When a creature dies thanks to Hero's Downfall:
60 other cards care about it too. These are the ones with the most connections.
a creature dies — 2,830 cards in the game can cause this (Hero's Downfall is one).
When a creature dies thanks to Hero's Downfall:
450 other cards care about it too. These are the ones with the most connections.
a creature goes to a graveyard — 3,011 cards in the game can cause this (Hero's Downfall is one).
When a creature or planeswalker hits the graveyard thanks to Hero's Downfall:
10 other cards care about it too. These are the ones with the most connections.
an instant is cast — 3,931 cards in the game can cause this (Hero's Downfall is one).
When Hero's Downfall is cast:
427 other cards care about it too. These are the ones with the most connections.
a nontoken creature leaves the battlefield — 4,133 cards in the game can cause this (Hero's Downfall is one).
3 other cards care about it too. These are the ones with the most connections.
a creature leaves the battlefield — 4,238 cards in the game can cause this (Hero's Downfall is one).
When a creature leaves the battlefield thanks to Hero's Downfall:
29 other cards care about it too. These are the ones with the most connections.
a card in a graveyard — 7,589 cards in the game can cause this (Hero's Downfall is one).
443 other cards care about it too. These are the ones with the most connections.