edhseer Commander synergy, explained
Instant // Land
Mana cost: {1}{U}{U}
Return target spell or nonland permanent an opponent controls to its owner's hand.
on-cast — bounce
As this land enters, you may pay 3 life. If you don't, it enters tapped.
Add {U}.
activated {T} — adds 1 mana
Causes: an artifact leaves the battlefield, a battle leaves the battlefield, a creature leaves the battlefield, an enchantment leaves the battlefield, a planeswalker leaves the battlefield, a spell leaves the battlefield.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Sink into Stupor is one).
When Sink into Stupor // Soporific Springs enters:
199 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 (Sink into Stupor is one).
When Sink into Stupor // Soporific Springs 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 (Sink into Stupor 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 (Sink into Stupor is one).
When a creature leaves the battlefield thanks to Sink into Stupor // Soporific Springs:
26 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 (Sink into Stupor is one).
31 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 (Sink into Stupor is one).
When Sink into Stupor // Soporific Springs is cast:
5 other cards care about it too. These are the ones with the most connections.