edhseer Commander synergy, explained
Sorcery
Mana cost: {2}{B}{B}
Return up to one target creature card from your graveyard to the battlefield.
on-cast — brings a card back
For each opponent who has three or more poison counters as you cast this spell, put up to one target creature card from that player's graveyard onto the battlefield under your control.
on-cast — brings a card back
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 (Geth's Summons is one).
When a creature leaves a graveyard thanks to Geth's Summons:
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 (Geth's Summons is one).
When a creature leaves a graveyard thanks to Geth's Summons:
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 (Geth's Summons is one).
When Geth's Summons 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 (Geth's Summons is one).
When a creature enters thanks to Geth's Summons:
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 (Geth's Summons 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 (Geth's Summons 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 (Geth's Summons is one).
When Geth's Summons is cast:
6 other cards care about it too. These are the ones with the most connections.