edhseer Commander synergy, explained
Creature — Phyrexian Horror
Mana cost: {4}{B}
Infect
Whenever a source deals damage to this creature, that source's controller gets a poison counter.
triggered — puts counters on it
Causes: put a counter on anything.
Cares about: nothing.
a Horror deals combat damage — 382 cards in the game can cause this (Reaper of Sheoldred is one).
a Phyrexian attacks — 495 cards in the game can cause this (Reaper of Sheoldred is one).
a nontoken Phyrexian enters the battlefield — 496 cards in the game can cause this (Reaper of Sheoldred is one).
a Phyrexian enters the battlefield — 524 cards in the game can cause this (Reaper of Sheoldred is one).
anything gets a counter — 4,415 cards in the game can cause this (Reaper of Sheoldred is one).
8 other cards care about it too. These are the ones with the most connections.
anything attacks — 17,934 cards in the game can cause this (Reaper of Sheoldred is one).
When Reaper of Sheoldred attacks:
111 other cards care about it too. These are the ones with the most connections.
a creature attacks — 17,934 cards in the game can cause this (Reaper of Sheoldred is one).
When Reaper of Sheoldred attacks:
180 other cards care about it too. These are the ones with the most connections.
a creature blocks — 17,934 cards in the game can cause this (Reaper of Sheoldred is one).
When Reaper of Sheoldred blocks:
18 other cards care about it too. These are the ones with the most connections.
a nontoken creature attacks — 17,934 cards in the game can cause this (Reaper of Sheoldred is one).
When Reaper of Sheoldred attacks:
a creature deals combat damage — 17,934 cards in the game can cause this (Reaper of Sheoldred is one).
When Reaper of Sheoldred deals combat damage:
194 other cards care about it too. These are the ones with the most connections.
a creature is cast — 18,010 cards in the game can cause this (Reaper of Sheoldred is one).
When Reaper of Sheoldred is cast:
81 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 (Reaper of Sheoldred is one).
32 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 (Reaper of Sheoldred is one).
When Reaper of Sheoldred enters:
300 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 (Reaper of Sheoldred is one).
40 other cards care about it too. These are the ones with the most connections.