Perimeter Patrol

Creature — Human Soldier

Produces: nothing.

Cares about: an artifact entering the battlefield.

Partners

1,090 cards can cause an artifact entering the battlefield.

1. Spawning Pit — When a Spawn enters thanks to Spawning Pit, Perimeter Patrol gives +1/+0
2. Basalt Golem — When a Wall enters thanks to Basalt Golem, Perimeter Patrol gives +1/+0
3. Threefold Thunderhulk — When a Gnome enters thanks to Threefold Thunderhulk, Perimeter Patrol gives +1/+0
4. Castle Doom — When a Robot enters thanks to Castle Doom, Perimeter Patrol gives +1/+0
5. Witch's Oven — When a Food enters thanks to Witch's Oven, Perimeter Patrol gives +1/+0
6. Scarecrone — When Scarecrone enters, Perimeter Patrol gives +1/+0
7. The Gold Saucer — When a Treasure enters thanks to The Gold Saucer, Perimeter Patrol gives +1/+0
8. Kuldotha Forgemaster — When Kuldotha Forgemaster enters, Perimeter Patrol gives +1/+0

234 other cards cause it too, equally specific. The ones shown are the best connected.