I'll be editing their sheet to show their decreased power and put them in low tier. How many low tiers do you think a mid tier could fight off? I'd want to have them in groups at about that number so it would be a pretty even fight. Then of course against other low tiers they'd be fighting one of them doing recon or something. If someone wants the extra challenge they can request more for that battle.

If they are summoned how I think things like Yu-Gi-Oh summons then that would be odd for them, as they cannot teleport, but we'll see what the rules state.