common pairings include draw-sevens like Timetwister and cards that let you play lands from zones other than your hand, like Courser of Kruphix and Crucible of Worlds
Theyre a natural fit for archetypes like aristocrats, midrange grind decks, and fast aggro builds that pressure opponents while creating long-term advantages
Since you have to maintain the board with something other than this, it seems like you have to have very high 'expectations for impulse draw'
In addition, if your spiders kill any creatures in combat, you get to turn them into Food tokens for incidental life gain
If you dont have a big play involving Arwen
Averna, the Chaos Bloom has a super neat cascade-related ability that lets you ramp which is always useful in a game of Commander