Attercop

Creature — Spider

Produces: nothing.

Cares about: a land entering the battlefield.

Partners

131 cards can cause a Spider it boosts.

1. Wall Crawl — Wall Crawl gives Attercop bigger stats

403 cards can cause a Spider creature it grants types to.

1. Spider-Suit — Spider-Suit gives Attercop an extra creature type

406 cards can cause a land entering the battlefield.

1. Hedge Shredder — When a land enters thanks to Hedge Shredder, Attercop gives +1/+1
2. Shigeki, Jukai Visionary — When a land enters thanks to Shigeki, Jukai Visionary, Attercop gives +1/+1
3. Cavalier of Thorns — When a land enters thanks to Cavalier of Thorns, Attercop gives +1/+1
4. Far Wanderings — When a land enters thanks to Far Wanderings, Attercop gives +1/+1
5. Yuna's Decision — When a creature enters thanks to Yuna's Decision, Attercop gives +1/+1
6. Perilous Forays — When a land enters thanks to Perilous Forays, Attercop gives +1/+1
7. Flare of Cultivation — When a land enters thanks to Flare of Cultivation, Attercop gives +1/+1
8. Pull Through the Weft — When a land enters thanks to Pull Through the Weft, Attercop gives +1/+1

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