Haha just a general rule of thumb: Just because something sounds cool and strong, doesnt mean it is (your hammer). some of the strongest items are Peas and grapes xD Well I would suggest getting a Scroll of the Ultra Nova definitely and also buy a Downsize! (Forgot the price on that) That is an excellent defense item that could be paired with the Scroll. Now if you want a cheap-ish freezer, a Randomly Firing freeze Ray for ~225k is a good buy. But I would go about your battles like this(alway use the 3 icon ability thingy):
Move 1: (assuming you have the Freeze ray) Use the RFFR to hopefully freeze the opponent and use downsize to block damage
Move 2: Use 2 Scrolls (or snowager sword) to implement most damage possible
Move 3: (if necessary) Scarab ring and Scorchstone
Move 4+: Scarab ring and scroll until opponent is down
Now assuming you didn't buy the freezer, I'd do this:
Move 1: Scroll and Downsize
Move 2: Scarab ring and Scroll
Move 3: Scorchstone and Scarab ring
Move 4+: repeat step 2 for as long as the battle goes on
Hope this helps