edhseer Commander synergy, explained
Land
This land enters tapped.
When this land enters, target creature gets +1/+1 and gains vigilance until end of turn.
triggered — gives +1/+1
triggered — grants a keyword
Add {W}.
activated {T} — adds 1 mana
Causes: nothing.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Sandstone Bridge is one).
When Sandstone Bridge enters:
199 other cards care about it too. These are the ones with the most connections.