Erratic Apparition

Creature — Spirit

Produces: nothing.

Cares about: an enchantment entering the battlefield, a Room being fully unlocked.

Partners

162 cards can cause an enchantment entering the battlefield.

1. Lazotep Quarry — When a Zombie enters thanks to Lazotep Quarry, Erratic Apparition gives +1/+1
2. Gerrard's Hourglass Pendant — When Gerrard's Hourglass Pendant enters, Erratic Apparition gives +1/+1
3. Soul Separator — When a Spirit enters thanks to Soul Separator, Erratic Apparition gives +1/+1
4. God-Pharaoh's Gift — When a Zombie enters thanks to God-Pharaoh's Gift, Erratic Apparition gives +1/+1
5. Hour of Eternity — When a Zombie enters thanks to Hour of Eternity, Erratic Apparition gives +1/+1
6. Glimmerlight — When a Glimmer enters thanks to Glimmerlight, Erratic Apparition gives +1/+1
7. Extravagant Replication — When a creature enters thanks to Extravagant Replication, Erratic Apparition gives +1/+1
8. Eldrazi Confluence — When a creature enters thanks to Eldrazi Confluence, Erratic Apparition gives +1/+1

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