edhseer Commander synergy, explained
Land — Mountain
({T}: Add {R}.)
This land enters tapped.
Shuffle your library. Activate only if you control two or more red permanents.
activated {R}, {T} —
Causes: shuffle a library.
Cares about: nothing.
a Mountain enters the battlefield — 64 cards in the game can cause this (Madblind Mountain is one).
When Madblind Mountain enters:
a land enters the battlefield — 1,560 cards in the game can cause this (Madblind Mountain is one).
When Madblind Mountain enters:
199 other cards care about it too. These are the ones with the most connections.