Spara's Headquarters

an Island is discarded — 10 cards in the game can cause this (Spara's Headquarters is one).

1. Mary Read and Anne Bonny — When Spara's Headquarters makes a player discard a card, Mary Read and Anne Bonny makes a token

an Island enters the battlefield — 64 cards in the game can cause this (Spara's Headquarters is one).

1. Staff of the Mind Magus — When Spara's Headquarters enters, Staff of the Mind Magus gains you 1 life

a land is discarded — 69 cards in the game can cause this (Spara's Headquarters is one).

When Spara's Headquarters makes a player discard a card:

1. Bone Miser — adds 2 mana
2. Green Goblin, Nemesis — makes a token
3. Surly Badgersaur — makes a token
4. Doctor Doom, King of Latveria — makes each opponent lose 2 life
5. Invasion of Kaldheim // Pyre of the World Tree — exiles a card from your library

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

a Plains enters the battlefield — 72 cards in the game can cause this (Spara's Headquarters is one).

When Spara's Headquarters enters:

1. Koth of the Homestead — puts a counter on a creature
2. Staff of the Sun Magus — gains you 1 life

a Forest enters the battlefield — 85 cards in the game can cause this (Spara's Headquarters is one).

When Spara's Headquarters enters:

1. Titania, Nature's Force — makes a token
2. Baru, Fist of Krosa — gives +1/+1
3. Reach of Branches — returns itself from the graveyard
4. Tourach's Chant — deals 3 damage
5. Battlewand Oak — gets +2/+2
6. Staff of the Wild Magus — gains you 1 life
7. Necklace of Girion — puts a counter on a creature
8. Roiling Canopy — gives +3/+3

a land goes to a graveyard — 681 cards in the game can cause this (Spara's Headquarters is one).

When Spara's Headquarters hits the graveyard:

1. Turntimber Sower — makes a token
2. The Gitrog Monster — draws you 1 card
3. Skola Grovedancer — gains you 1 life
4. Sand Scout — makes a token
5. Crawling Sensation — makes a token
6. Countryside Crusher — puts a +1/+1 counter on itself
7. Titania, Voice of Gaea — gains you 2 life
8. Centaur Vinecrasher — returns itself from the graveyard
9. Slogurk, the Overslime — puts a +1/+1 counter on itself

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

a land enters the battlefield — 1,542 cards in the game can cause this (Spara's Headquarters is one).

When Spara's Headquarters enters:

1. Primeval Bounty — gains you 3 life
2. Dancing from Dark to Dawn — makes a token
3. Toph, Earthbending Master — puts a counter on a permanent
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

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

a card is discarded — 2,028 cards in the game can cause this (Spara's Headquarters is one).

When Spara's Headquarters makes a player discard a card:

1. Ivora, Insatiable Heir — puts a +1/+1 counter on itself
2. Cool but Rude — deals 2 damage
3. Containment Construct — brings a card back
4. Moonstone, Harsh Mistress — brings a card back
5. Lazotep Chancellor — puts 2 counters on a Zombie or Army
6. Magmakin Artillerist — deals that much damage
7. Inti, Seneschal of the Sun — exiles a card from your library
8. Pitchstone Wall — sacrifices itself
9. Currency Converter — exiles it
10. Hostile Investigator — triggers

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

a card is drawn — 3,766 cards in the game can cause this (Spara's Headquarters is one).

When Spara's Headquarters makes a player draw a card:

1. Temmet, Naktamun's Will — gives +1/+1
2. Niv-Mizzet, Parun — deals 1 damage
3. Aether Syphon — mills a card
4. The Locust God — makes a token
5. Diviner's Wand — gets +1/+1
6. Starving Revenant — makes each opponent lose 1 life
7. Ominous Seas — puts a foreshadow counter on itself
8. Dream Trawler — gets +1/+0
9. Iron Man, Armored Avenger — puts a counter on a creature
10. The Astonishing Ant-Man — puts a +1/+1 counter on itself

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

a card in a graveyard — 7,543 cards in the game can cause this (Spara's Headquarters is one).

1. Gale, Waterdeep Prodigy — When Spara's Headquarters is in the graveyard, Gale, Waterdeep Prodigy can bring it back
2. Transplant Theorist — When Spara's Headquarters is in the graveyard, Transplant Theorist can bring it back
3. Heart-Shaped Herb — When Spara's Headquarters is in the graveyard, Heart-Shaped Herb can bring it back
4. Wayward Angel — Spara's Headquarters fills your graveyard toward the 7 or more cards Wayward Angel needs

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