Honestly, with the way this show is, one wouldn't be enough.
I really enjoyed School Spirit for some of the insane magical girl antics and proof this isn't a tumblr show (since they actually made a lighthearted rape joke)
Monster Arm is a good one as well.
The first episode I ever saw was strangely, Banagic Wand. I loved it. But I guess it wasn't everyone's favorite episode.
Most episodes of this series are like 11 minutes anyway so you might find yourself watching more than usual. You might get a kind of "just one more" vibe from it, or at least that's how I felt.
There are a few lower quality episodes but I like the characters enough where even the most mundane shit could happen and I'd be content to watch them interact.