A couple of things i want to mention and hopefully some helpful suggestions as well:
the card you're looking for is called "
rousing OF souls"
Also looking at this deck it's basically a theros token party (with some uninvited goblins). My best recommendation is to take out the goblins in exchange for more soldier related spells like
captain's call,
akroan horse, akroan soldier,
attended knight,
captain of the watch, and possibly
murder investigation if you ever get a really big creature on the field. If you want to keep the red then focus more on sorcery and instant spells that
deal damage, let you scry, and strengthen your army of tokens. Also
brave the elements would be ideal if running white tokens. Tell me what are your thoughts?