uff.. the cuts are a damn good question. I only play EDH. ^^"
Hmm.. cut all
Gird for Battle, 1
Tethmos High Priest and 1
Defiant Strike, and add 3 copies of both new spells.
Grid of Battle is nice, but I think both new spells help you more, besides that, its only a sorcery. Since you've got "only" 8 targets for
Tethmos High Priest, I don't think its that important to play 4 copies of it. And
Defiant Strike, well its situational, but the scry 2 from
Stand Firm seems a little better, since you can influence your next draw.