Slag Fiend

Creature — Phyrexian Construct

Produces: nothing.

Cares about: an artifact in a graveyard.

Partners

320 cards can cause a Robot or Construct it boosts.

1. Ultron, Machine Overlord — Ultron, Machine Overlord gives Slag Fiend bigger stats

1,041 cards can cause an artifact in a graveyard.

1. Heart-Shaped Herb — When Heart-Shaped Herb is in the graveyard, Slag Fiend gets bigger
2. Shattergang Brothers — When Shattergang Brothers is in the graveyard, Slag Fiend gets bigger
3. Ruthless Technomancer — When Ruthless Technomancer is in the graveyard, Slag Fiend gets bigger
4. Trading Post — When Trading Post is in the graveyard, Slag Fiend gets bigger
5. Tergrid, God of Fright // Tergrid's Lantern — When Tergrid, God of Fright // Tergrid's Lantern is in the graveyard, Slag Fiend gets bigger
6. Syr Vondam, Sunstar Exemplar — When Syr Vondam, Sunstar Exemplar is in the graveyard, Slag Fiend gets bigger
7. Sivriss, Nightmare Speaker — When Sivriss, Nightmare Speaker is in the graveyard, Slag Fiend gets bigger
8. Scrounge for Eternity — When Scrounge for Eternity is in the graveyard, Slag Fiend gets bigger
9. Dawn-Blessed Pennant — When Dawn-Blessed Pennant is in the graveyard, Slag Fiend gets bigger
10. Conjurer's Bauble — When Conjurer's Bauble is in the graveyard, Slag Fiend gets bigger
11. Codex Shredder — When Codex Shredder is in the graveyard, Slag Fiend gets bigger
12. Vulshok War Boar — When Vulshok War Boar is in the graveyard, Slag Fiend gets bigger
13. Acidic Dagger — When Acidic Dagger is in the graveyard, Slag Fiend gets bigger
14. Krenko, Baron of Tin Street — When Krenko, Baron of Tin Street is in the graveyard, Slag Fiend gets bigger
15. Runesword — When Runesword is in the graveyard, Slag Fiend gets bigger
16. Legion Extruder — When Legion Extruder is in the graveyard, Slag Fiend gets bigger

1,450 other cards ask for it too, equally specific. The ones shown are the best connected.