edhseer Commander synergy, explained
Instant
Mana cost: {2}{R}
Each attacking creature gets +1/+0 until end of turn for each nonbasic land defending player controls.
on-cast — gives +1/+0 for each nonbasic land defending player controls
Causes: nothing.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Mercadia's Downfall is one).
When Mercadia's Downfall 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 (Mercadia's Downfall is one).
When Mercadia's Downfall is cast:
5 other cards care about it too. These are the ones with the most connections.