edhseer Commander synergy, explained
Instant
Mana cost: {B}{B}
Until end of turn, all creatures become black and all lands become Swamps.
on-cast — makes your creatures bigger
Causes: nothing.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Nightcreep is one).
When Nightcreep 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 (Nightcreep is one).
When Nightcreep is cast:
5 other cards care about it too. These are the ones with the most connections.