side decking for agents?

This format like half of the duelists are using agents.. but how do you side deck, for a mirror match? You can't side Light - Imprisoning mirror

Leeching the Light and Effect Veiler/Divine Wrath are good options. Further, Safe Zone can help you bait out their Hyperion's effect, after which you target Hyperion, and then it dies. I take it you are not using a build that plays Sanctuary in the Sky?

Would depend on the build (both yours and your opponents)

But try these nevertheless:

Leeching the Light- this does not conflict with your own plays, gets rid of hyperions/krystias, can deal alot of damage, and perhaps enable you to push for game

Kycoo the Ghost Destroyer- banishes their earth/venus (or shine balls) to interrupt their hyperion/krystia plays, and protects your own grave

Maxx "C"- allows you to draw cards, 'nuff said

Thunder King Rai Oh- situational card, but powerful if used at the right time

Tragoedia- if you dont main this already, its pretty good in a mirror as you ditch your own earth/venus to steal their copy while creating fodder in your grave for hyperion/krystia

Herald of Orange Light- you should main these already but if you dont side these in/add more copies