edhseer Commander synergy, explained
Legendary Land — Gate
As The Black Gate enters, you may pay 3 life. If you don't, it enters tapped.
Add {B}.
activated {T} — adds 1 mana
Choose a player with the most life or tied for most life. Target creature can't be blocked by creatures that player controls this turn.
activated {1}{B}, {T} — restricts what can block it
Causes: nothing.
Cares about: nothing.
a Gate enters the battlefield — 25 cards in the game can cause this (The Black Gate is one).
When The Black Gate enters:
a land enters the battlefield — 1,560 cards in the game can cause this (The Black Gate is one).
When The Black Gate enters:
200 other cards care about it too. These are the ones with the most connections.