Adrestia

an artifact is cast — 2,238 cards in Adrestia's colors can cause this (Adrestia is one).

When Adrestia is cast:

1. Patchwork Automaton — puts a +1/+1 counter on itself
2. Golem Foundry — puts a charge counter on itself
3. Golem's Heart — gains you 1 life
4. Urza's Chalice — gains you 1 life
5. Solar Array — grants sunburst
6. The Fantasticar — turns something into a creature
7. Machine Man, Model X-51 — puts a +1/+1 counter on itself
8. Levitating Statue — puts a +1/+1 counter on itself
9. Scroll of the Masters — puts a lore counter on itself
10. The Vision — triggers

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

a nontoken artifact enters the battlefield — 2,243 cards in Adrestia's colors can cause this (Adrestia is one).

When Adrestia enters:

1. Ultron, Artificial Malevolence — makes a token
2. Surge Conductor — proliferates
3. Mirrorworks — makes a token

a card is drawn — 302 cards in Adrestia's colors can cause this (Adrestia is one).

When Adrestia makes a player draw a card:

1. Diviner's Wand — gets +1/+1
2. Psychosis Crawler — makes each opponent lose 1 life
3. Moonring Mirror — exiles a card from your library

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

an artifact enters the battlefield — 2,261 cards in Adrestia's colors can cause this (Adrestia is one).

When Adrestia enters:

1. Arcbound Crusher — puts a +1/+1 counter on itself
2. Battered Golem — untaps itself
3. Grinding Station — untaps itself
4. Serum Tank — puts a charge counter on itself
5. Gonti's Aether Heart — puts 2 counters on a permanent
6. Tezzeret, Cruel Captain — puts a loyalty counter on itself

anything that is not a token enters the battlefield — 2,691 cards in Adrestia's colors can cause this (Adrestia is one).

1. Canoptek Spyder — When Adrestia enters, Canoptek Spyder draws you 1 card