I certainly agree with Logress' wisdom on the matter, but adjusting numbers on top meta units will not destroy their effectiveness in file. For Urgrant, giving him 10 less attack so he can only do up to 75 dmg instead of 85 dmg won't destroy Urgrant files, it will keep guardian alive for 1 more counter. Same goes for Ryu, once he is un-attackable, you have a double attacker with at least 50 atk that also debuffs- maybe lower the bonus attack to +10 instead of +20.
It also might seem un-professional, but nerfing a card isn't set-in-stone finality, it can always receive further updates or simply be reverted back to pre-nerf, so 'experimenting' isn't necessarily a bad thing.
Edit: Back to Urgrant- For flavor and logicality, I think Urgrant should have a restriction similar to plundering pirate girl where the rival iczer needs to have 1 sp in order to steal it for bonus damage. That or you still get the bonus damage, but you only get refunded 1 sp if rival iczer lost 1 sp. That way when a player uses their sp to prevent loss, the Urgrant player has to make the decision to spend 1 sp with no return to do the extra damage.
Ex Brahma was a great addition to EM, but will their be any further touch ups? Maybe reduce seraphs contaminate air action skill to 0 sp, or give her autoskill atk boost?
Can Igina get +10 max hp? She warrants her own style of a file, yet is extremely easily nukeable by SS/open etc.
Edit2: Thanks for being consistent and active in this thread