Serra's Sanctum

a land it grants abilities to — 1,237 cards in the game can cause this.

1. Mystic Skull // Mystic Monstrosity — Mystic Skull // Mystic Monstrosity gives Serra's Sanctum an extra ability
2. Chromatic Lantern — Chromatic Lantern gives Serra's Sanctum an extra ability
3. Terra Eternal — Terra Eternal gives Serra's Sanctum indestructible
4. Petrified Hamlet — Petrified Hamlet gives Serra's Sanctum an extra ability

1,233 other cards cause it too. These are the ones with the most connections.

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

When Serra's Sanctum 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

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

an enchantment you control — 3,657 cards in the game can cause this.

1. Nature's Wrath — While you control Nature's Wrath, Serra's Sanctum counts it and does more
2. Search for Dagger — While you control Search for Dagger, Serra's Sanctum counts it and does more
3. Confusion in the Ranks — While you control Confusion in the Ranks, Serra's Sanctum counts it and does more
4. Bloodbond March — While you control Bloodbond March, Serra's Sanctum counts it and does more
5. Calix, Guided by Fate — While you control Calix, Guided by Fate, Serra's Sanctum counts it and does more
6. Candlekeep Sage — While you control Candlekeep Sage, Serra's Sanctum counts it and does more
7. Daxos, Blessed by the Sun — While you control Daxos, Blessed by the Sun, Serra's Sanctum counts it and does more
8. Dual Nature — While you control Dual Nature, Serra's Sanctum counts it and does more
9. Storm the Vault // Vault of Catlacan — While you control Storm the Vault // Vault of Catlacan, Serra's Sanctum counts it and does more
10. Tainted Aether — While you control Tainted Aether, Serra's Sanctum counts it and does more

3,647 other cards use it too. These are the ones with the most connections.