Trenchpost

a Locus you control — 3 cards in the game can cause this.

1. Glimmerpost — While you control Glimmerpost, Trenchpost counts it and mills more
2. Cloudpost — While you control Cloudpost, Trenchpost counts it and mills more

1 other card uses it too. These are the ones with the most connections.

a card is milled — 772 cards in the game can cause this (Trenchpost is one).

1. Lo and Li, Royal Advisors — When Trenchpost makes a player mill a card, Lo and Li, Royal Advisors puts a counter on an Advisor

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

When Trenchpost 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.

a card in a graveyard — 7,589 cards in the game can cause this (Trenchpost is one).

1. Samwise Gamgee — Trenchpost puts cards into the graveyard that Samwise Gamgee can bring back
2. Fire Nation Salvagers — Trenchpost puts cards into the graveyard that Fire Nation Salvagers can bring back
3. Bloodbond March — Trenchpost puts cards into the graveyard that Bloodbond March can bring back
4. Thor, God of Thunder — Trenchpost puts cards into the graveyard that Thor, God of Thunder can bring back
5. Gale, Waterdeep Prodigy — Trenchpost puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
6. Harness the Storm — Trenchpost puts cards into the graveyard that Harness the Storm can bring back
7. Transplant Theorist — Trenchpost puts cards into the graveyard that Transplant Theorist can bring back
8. Heart-Shaped Herb — Trenchpost puts cards into the graveyard that Heart-Shaped Herb can bring back
9. Wayward Angel — Trenchpost fills your graveyard toward the 7 or more cards Wayward Angel needs
10. Rescue from the Underworld — Trenchpost puts cards into the graveyard that Rescue from the Underworld can bring back

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 (Trenchpost is one).

When a card hits the graveyard thanks to Trenchpost:

1. The Haunt of Hightower — puts a +1/+1 counter on itself
2. Duskmantle Guildmage — makes each opponent lose 1 life
3. Vulturous Zombie — puts a +1/+1 counter on itself
4. Quest for Ancient Secrets — puts a quest counter on itself
5. Bloodchief Ascension — makes each opponent lose 2 life
6. Compost — draws you 1 card
7. Planar Void — hits a graveyard
8. Measure of Wickedness — gives an opponent control of itself
9. Energy Field — sacrifices itself

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