Grim Master is a cool name. Sounds like a Darth Vader type of dude. That's Dinopope, yes?
Also, more Microns are never a bad thing. Not interested in the Prime himself though, so will be missing out on these little dudes. Since it looks like he has a sword/halberd sort of thing, I'd say Ratchet's maybe Arcee's, likely his own, maybe Soundwave's, and Bee's?
assembling a Neo-G1/TF:TM cast. Please PM if you have (or know of) the following at a reasonable price: Classics or Henkei Astrotrain, Ramjet, Sunstreaker, Sideswipe, Blurr, or 3rd Party Motobot Arcee, iGear Ratchet and Ironhide.
Also looking for Universe Repugnus and Overbite, Frostbite and Longhorn and any Webdiver toys.