edhseer Commander synergy, explained
Land
When this land enters, you may exile a colorless card with mana value 7 or greater from your hand.
triggered —
Add {C}. If a card is exiled with this land, add {C}{C} instead.
activated {T} — adds 1 mana
activated {T} — adds 2 mana
Return the exiled card to its owner's hand.
Causes: exile a card.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Ugin's Labyrinth is one).
When Ugin's Labyrinth enters:
199 other cards care about it too. These are the ones with the most connections.
anything is exiled — 2,497 cards in the game can cause this (Ugin's Labyrinth is one).