very nice deck idea^^
hmm i would say -2 mystic box and +2-3 creature swap then u can swap the tokens of the grinder golem to get the golem
then u need more defense if you drawed bad so -2 dimension wall and +2-3 threatning roar
in that deck i would say u can play skill drain its would work good in that i think
to the monsters:-3 plasma u have enough for trade in +2tomatos for a little defense and speed
and then +2 krebons and the emergency teleport so u can play synchros if nothing other work
and the tomatos are very good if u play the creature swap i sayed ^^
then -1 marschmallon u dont need him ifu play the roars. then you should have enough darks and if you want u can play the dark armed dragon, then maybe u can play morphing jar its good wehn you draw bad and if u play him you can play pot of averice too to get the monsters back to deck ^^
hmm and you need lot of speed in such a deck to have the right cards so you can play things like reckles greed 3 times or hand destruction upstart goblin dont know its up to you ^^
i hope you like my ideas and im glad if your deck work a little better then
if u want to test that deck im always ready for a duel
ahh btw if u play synchros in that dont forget the plaguespreader zombie