Crosstown Courier

Creature — Vedalken

Produces: anything being milled.

Cares about: nothing.

Partners

602 cards can cause anything being milled.

1. Lo and Li, Royal Advisors — When Crosstown Courier mills a card, Lo and Li, Royal Advisors puts counters on a permanent
2. Saruman of Many Colors — When Crosstown Courier mills a card, Saruman of Many Colors hits a graveyard

6,862 cards can cause a card in a graveyard.

1. Heart-Shaped Herb — When Crosstown Courier is in the graveyard, Heart-Shaped Herb can bring it back
2. Victimize — When Crosstown Courier is in the graveyard, Victimize can bring it back
3. Bound // Determined — When Crosstown Courier is in the graveyard, Bound // Determined can bring it back
4. Boneshard Slasher — Crosstown Courier fills your graveyard toward the 7 or more cards Boneshard Slasher needs
5. Wayward Angel — Crosstown Courier fills your graveyard toward the 7 or more cards Wayward Angel needs
6. Tergrid, God of Fright // Tergrid's Lantern — When Crosstown Courier is in the graveyard, Tergrid, God of Fright // Tergrid's Lantern can bring it back
7. Kirtar's Wrath — Crosstown Courier fills your graveyard toward the 7 or more cards Kirtar's Wrath needs
8. Merfolk Windrobber — Crosstown Courier fills an opponent's graveyard toward the 8 or more cards Merfolk Windrobber needs

404 other cards ask for it too, equally specific. The ones shown are the best connected.