Infantry Pulse and team building questions.

So, my Ayra is +Spd -Def +2 with S in Summoner Support, Ally supported by Axzura, and has Distant Counter, Wrath, and Savage Blow/Hone Speed equipped more often than not. My questions are, wouldn't Wrath and Infantry Pulse stack and if so, how good would this be? And 2nd: Does Infantry Pulse Impact the unit that has it equipped, or only other allies? Thinking of potentially throwing it on a teammate, most likely Ephraim or Chrom (Seliph is also a possibility, but I would have to build him and while I could do that, I don't know if building him would actually make him more useful than Chrom or Ephraim) due to Ayra having 47 HP already, meaning only a handful of units can actually use it with her. Both have Fury/Renewal sets, and 48 HP, both are +Atk -Res, and both fulfill similar roles. On one hand, Falcion is getting buffed soon and will counter Dragons which are more prevalent now more than ever before, and I run Aether with Heavy Blade Seal on him since he has 60 Atk. He has 28 Spd, 34 Def, and 16 Res. However, it would mean having two red units on my team which I don't really care for. Ephraim on the other hand, is a blue unit whose weapon is already refined with +Eff. He is unmerged, and his Special is Moonbow. His stat line is 57 Atk, 28 Spd, 35 Def, 20 Res. So -3 attack, equal speed, +1 Def, and +4 Res. I would have to get enough Divine Dew for Chrom's weapon, which would take time. For Ephraim, I could do a Hone Speed Seal, or Brash Assault Seal. All in all it's a tough choice, and I'm not sure if it would even be worth all the effort. As for where Infantry Pulse will come from, I could just promote my 4* Marisa to 5* with feathers I have saved.