Baldur's Gate

a Gate you control — 23 cards in the game can cause this.

1. Heap Gate — While you control Heap Gate, Baldur's Gate counts it and does more
2. Basilisk Gate — While you control Basilisk Gate, Baldur's Gate counts it and does more
3. Talon Gates of Madara — While you control Talon Gates of Madara, Baldur's Gate counts it and does more
4. The Black Gate — While you control The Black Gate, Baldur's Gate counts it and does more
5. Citadel Gate — While you control Citadel Gate, Baldur's Gate counts it and does more
6. Cliffgate — While you control Cliffgate, Baldur's Gate counts it and does more
7. Rakdos Guildgate — While you control Rakdos Guildgate, Baldur's Gate counts it and does more
8. Gond Gate — While you control Gond Gate, Baldur's Gate counts it and does more
9. Dimir Guildgate — While you control Dimir Guildgate, Baldur's Gate counts it and does more
10. Orzhov Guildgate — While you control Orzhov Guildgate, Baldur's Gate counts it and does more

13 other cards use it too. These are the ones with the most connections.

a Gate enters the battlefield — 25 cards in the game can cause this (Baldur's Gate is one).

When Baldur's Gate enters:

1. Gate Colossus — returns itself from the graveyard
2. Guild Summit — draws you 1 card
3. Gateway Sneak — triggers

a land enters the battlefield — 1,560 cards in the game can cause this (Baldur's Gate is one).

When Baldur's Gate enters:

1. Primeval Bounty — gains you 3 life
2. Toph, Earthbending Master — puts a counter on a permanent
3. Dancing from Dark to Dawn — makes a token
4. Emeria Shepherd — brings a card back
5. Quest for the Necropolis — puts a quest counter on itself
6. Soul Stair Expedition — puts a quest counter on itself
7. Nissa of Shadowed Boughs — puts counters on a permanent
8. Thranduil, Sindarin Liege // Silvan Rally — makes a token
9. Silvan Reveler — returns itself from the graveyard
10. Floral Evoker — puts a +1/+1 counter on itself

200 other cards care about it too. These are the ones with the most connections.