They Came from the Pipes

an enchantment is cast — 3,673 cards in the game can cause this (They Came from the Pipes is one).

When They Came from the Pipes is cast:

1. Hallowed Haunting — makes a token
2. Daxos the Returned — puts a counter on a permanent
3. Tatsunari, Toad Rider — makes a token
4. Sythis, Harvest's Hand — gains you 1 life
5. Sigil of the Empty Throne — makes a token
6. Dawnhart Geist — gains you 2 life
7. Herald of the Pantheon — gains you 1 life
8. Kami of Transience — puts a +1/+1 counter on itself
9. Argothian Enchantress — draws you 1 card
10. Mesa Enchantress — draws you 1 card

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

a nontoken enchantment enters the battlefield — 3,691 cards in the game can cause this (They Came from the Pipes is one).

1. Historian's Boon — When They Came from the Pipes enters, Historian's Boon makes a token

an enchantment it makes cheaper to cast — 3,713 cards in the game can cause this.

1. Mana Matrix — Mana Matrix reduces what They Came from the Pipes costs

3,712 other cards cause it too. These are the ones with the most connections.

an enchantment enters the battlefield — 3,743 cards in the game can cause this.

When They Came from the Pipes:

1. Calix, Guided by Fate — enters, Calix, Guided by Fate puts a counter on a creature
2. Elvish Archivist — enters, Elvish Archivist draws you 1 card
3. Victor, Valgavoth's Seneschal — enters, Victor, Valgavoth's Seneschal surveils
4. Strength from the Fallen — enters, Strength from the Fallen gives +X/+X, where X is the number of creature cards in your graveyard
5. Doomwake Giant — enters, Doomwake Giant shrinks a creature by -1/-1
6. Cacophony Unleashed — enters, Cacophony Unleashed turns something into a creature
7. Ghostly Dancers — enters, Ghostly Dancers makes a token
8. Thassa's Devourer — enters, Thassa's Devourer mills a card
9. Displacer Kitten — enters thanks to Displacer Kitten, it triggers
10. Wiccan, Rising Magician — enters thanks to Wiccan, Rising Magician, it triggers
11. Gerrard's Hourglass Pendant — enters thanks to Gerrard's Hourglass Pendant, it triggers
12. Eldrazi Confluence — enters thanks to Eldrazi Confluence, it triggers
13. Extravagant Replication — enters because Extravagant Replication copies it, its ability triggers again
14. Elrond, Moon-Reader — enters thanks to Elrond, Moon-Reader, it triggers
15. Metamorphose — enters thanks to Metamorphose, it triggers
16. Killian, Decisive Mentor — enters, Killian, Decisive Mentor taps a creature
17. Thoughtrender Lamia — enters, Thoughtrender Lamia makes an opponent discard a card

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

a card is drawn — 3,815 cards in the game can cause this (They Came from the Pipes is one).

When They Came from the Pipes makes a player draw a card:

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

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

a card in a graveyard — 7,589 cards in the game can cause this (They Came from the Pipes is one).

They Came from the Pipes:

1. Samwise Gamgee — puts cards into the graveyard that Samwise Gamgee can bring back
2. Bloodbond March — puts cards into the graveyard that Bloodbond March can bring back
3. Gale, Waterdeep Prodigy — puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
4. Harness the Storm — puts cards into the graveyard that Harness the Storm can bring back
5. Transplant Theorist — puts cards into the graveyard that Transplant Theorist can bring back
6. Heart-Shaped Herb — puts cards into the graveyard that Heart-Shaped Herb can bring back
7. Wayward Angel — fills your graveyard toward the 7 or more cards Wayward Angel needs
8. Rescue from the Underworld — puts cards into the graveyard that Rescue from the Underworld can bring back
9. Victimize — puts cards into the graveyard that Victimize can bring back
10. Sidequest: Card Collection // Magicked Card — fills your graveyard toward the 8 or more cards Sidequest: Card Collection // Magicked Card needs

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

anything goes to a graveyard — 7,589 cards in the game can cause this (They Came from the Pipes is one).

When a card hits the graveyard thanks to They Came from the Pipes:

1. Quest for Ancient Secrets — puts a quest counter on itself
2. Planar Void — hits a graveyard
3. Measure of Wickedness — gives an opponent control of itself
4. Energy Field — sacrifices itself

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

anything enters the battlefield — 26,499 cards in the game can cause this (They Came from the Pipes is one).

1. The Reaper, King No More — When The Reaper, King No More enters thanks to They Came from the Pipes, it puts a counter on a creature
2. Rosheen, Roaring Prophet — When Rosheen, Roaring Prophet enters thanks to They Came from the Pipes, it mills a card
3. Kotose, the Silent Spider — When Kotose, the Silent Spider enters thanks to They Came from the Pipes, it brings a card back
4. Meathook Massacre II — When Meathook Massacre II enters thanks to They Came from the Pipes, it makes a player sacrifice a creature
5. Sokka, Bold Boomeranger — When Sokka, Bold Boomeranger enters thanks to They Came from the Pipes, it draws and discards
6. Nature's Wrath — When They Came from the Pipes enters, Nature's Wrath makes a player sacrifice an Island or permanent
7. Hei Bai, Forest Guardian — When Hei Bai, Forest Guardian enters thanks to They Came from the Pipes, it puts a Shrine onto the battlefield

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