I was playing a Magic Amp deck right when the expansion launched. It does pretty well. I found the Forest Dragons to be too expensive for what they did and so didn't focus on the Thirion sub-theme. Grimlic's Bane should be in your deck as it does 21 damage when fully amped. The same goes for Naturalize; that spell can destroy a number of relics at full amp for 20 nora. In my deck I used Gnarlwood Lifegivers for healing. Otherwise, a pretty similar deck. Oh yeah, Starlight Sylph with Encouraged can be a heavy hitter.
Been working on a magic amp bg as well, mostly went off what I was seeing others play Here's what I have so far, any tips would be appreciated
Maybe drop the light of the circle and eleven tender for a second chosen and a second trickster. Also perhaps drop 1 grimlics bane for a grimlics eye? Depends on now much stealth you run into. Could also use aurora banner over eye, bur a bit harder to use