edhseer Commander synergy, explained
Land
Add one mana of any color. During your next untap step, as you untap your permanents, return this land to its owner's hand.
activated {T} — adds 1 mana
activated {T} — bounce
Causes: a land leaves the battlefield.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Undiscovered Paradise is one).
When Undiscovered Paradise enters:
199 other cards care about it too. These are the ones with the most connections.