edhseer Commander synergy, explained
Land — Island
({T}: Add {U}.)
This land enters tapped.
Look at the top card of target player's library. Activate only if you control two or more blue permanents.
activated —
Causes: nothing.
Cares about: nothing.
an Island enters the battlefield — 64 cards in the game can cause this (Moonring Island is one).
a land enters the battlefield — 1,560 cards in the game can cause this (Moonring Island is one).
When Moonring Island enters:
199 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 (Moonring Island is one).
18 other cards care about it too. These are the ones with the most connections.