edhseer Commander synergy, explained
Land
This land enters tapped.
When this land enters, return a land you control to its owner's hand.
triggered — bounce
Add {R}{W}.
activated {T} — adds 2 mana
Causes: a land leaves the battlefield.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Boros Garrison is one).
When Boros Garrison enters:
199 other cards care about it too. These are the ones with the most connections.