edhseer Commander synergy, explained
Land
This land enters tapped.
When this land enters, target creature an opponent controls doesn't untap during its controller's next untap step.
triggered — keeps permanents from untapping
Add {U}.
activated {T} — adds 1 mana
Causes: nothing.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Skyline Cascade is one).
When Skyline Cascade enters:
199 other cards care about it too. These are the ones with the most connections.