Mystic Familiar

Creature — Bird

Produces: nothing.

Cares about: a card in a graveyard.

Partners

323 cards can cause a Bird it boosts.

1. Murmuration — Murmuration gives Mystic Familiar bigger stats

373 cards can cause a Bird creature it boosts.

1. Soulcatchers' Aerie — Soulcatchers' Aerie gives Mystic Familiar bigger stats
2. Soraya the Falconer — Soraya the Falconer gives Mystic Familiar bigger stats
3. Aven Brigadier — Aven Brigadier gives Mystic Familiar bigger stats

385 cards can cause a Rabbit, Bat or Bird it boosts.

1. Valley Questcaller — Valley Questcaller gives Mystic Familiar bigger stats

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

1. Heart-Shaped Herb — Heart-Shaped Herb fills your graveyard toward the 7 or more cards Mystic Familiar needs
2. Victimize — Victimize fills your graveyard toward the 7 or more cards Mystic Familiar needs
3. Come Back Wrong — Come Back Wrong fills your graveyard toward the 7 or more cards Mystic Familiar needs
4. Bound // Determined — Bound // Determined fills your graveyard toward the 7 or more cards Mystic Familiar needs
5. Boneshard Slasher — Boneshard Slasher fills your graveyard toward the 7 or more cards Mystic Familiar needs
6. Wayward Angel — Wayward Angel fills your graveyard toward the 7 or more cards Mystic Familiar needs
7. Shattergang Brothers — Shattergang Brothers fills your graveyard toward the 7 or more cards Mystic Familiar needs
8. Ruthless Technomancer — Ruthless Technomancer fills your graveyard toward the 7 or more cards Mystic Familiar needs

6,854 other cards ask for it too, equally specific. The ones shown are the best connected.