Shenanigans

an artifact in a graveyard — 1,226 cards in the game can cause this (Shenanigans is one).

Shenanigans puts cards into the graveyard that:

1. Bilbo, Unexpected Adventurer — can bring back
2. Narset, Enlightened Exile — can bring back
3. Fallaji Archaeologist — can bring back
4. T'Chaka, Venerable King — can bring back
5. Goblin Welder — can bring back
6. Saprazzan Bailiff — can bring back
7. Tomakul Scrapsmith — can bring back
8. Anrakyr the Traveller — can bring back
9. Chandra, Chill of Compliance — can bring back
10. Open the Vaults — can bring back

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

an artifact is put into a graveyard from the battlefield — 1,254 cards in the game can cause this (Shenanigans is one).

When an artifact is put into a graveyard from the battlefield thanks to Shenanigans:

1. Party Dude — draws you 1 card
2. Tezzeret's Touch — brings a card back
3. Krenko, Baron of Tin Street — makes a token
4. Shard of the Void Dragon — puts 2 +1/+1 counters on itself
5. Kibo, Uktabi Prince — puts a counter on an Ape or Monkey
6. Ich-Tekik, Salvage Splicer — puts a +1/+1 counter on itself
7. Gremlin Infestation — makes a token
8. Summoning Station — untaps itself
9. Pain Distributor — deals 1 damage
10. Fangren Marauder — gains you 5 life

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

a sorcery is cast — 3,720 cards in the game can cause this (Shenanigans is one).

When Shenanigans is cast:

1. The Emperor of Palamecia // The Lord Master of Hell — puts a +1/+1 counter on itself
2. Spellweaver Volute — copies a spell
3. Lilah, Undefeated Slickshot — gets +1/+1
4. Niblis of Frost — gets +1/+1

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