edhseer Commander synergy, explained
Instant
Mana cost: {U}
Look at target player's hand, the top card of that player's library, and any face-down creatures they control. Look at the top four cards of your library, then put them back in any order.
on-cast — sets the top of a library
Causes: nothing.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Spy Network is one).
When Spy Network 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 (Spy Network is one).
When Spy Network is cast:
5 other cards care about it too. These are the ones with the most connections.