edhseer Commander synergy, explained
Land — Island
({T}: Add {U}.)
This land enters tapped unless you control three or more other Islands.
static —
When this land enters untapped, you may put target instant or sorcery card from your graveyard on top of your library.
triggered — brings a card back
Causes: an instant leaves a graveyard, a sorcery leaves a graveyard.
Cares about: an instant in a graveyard, a sorcery in a graveyard.
an instant in a graveyard — 2 cards in the game can cause this (Mystic Sanctuary is one).
an Island enters the battlefield — 64 cards in the game can cause this (Mystic Sanctuary is one).
an instant leaves a graveyard — 202 cards in the game can cause this (Mystic Sanctuary is one).
a land enters the battlefield — 1,560 cards in the game can cause this (Mystic Sanctuary is one).
When Mystic Sanctuary enters:
199 other cards care about it too. These are the ones with the most connections.
anything leaves a graveyard — 2,503 cards in the game can cause this (Mystic Sanctuary is one).
When an instant or sorcery leaves a graveyard thanks to Mystic Sanctuary:
13 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 (Mystic Sanctuary is one).
17 other cards care about it too. These are the ones with the most connections.