You surely want to be able to cast this guy (or See the Unwritten, the same mana cost), so youll probably want to run Rattleclaw Mystic
Creating a baseline 2/1 myr and turning your, say, Treasure tokens into that is very powerful, but thats just the beginning
How about some targeted removal to deal with enemy threats (On Thin Ice, Gelid Shackles, Winter's Rest, card]Priest of the Haunted Ridge[/card])
GrimDeck was built to solve a problem that bugged us about every other tool on this list: none of them combine a proper deck builder with a proper collection tracker in a single, unified experience
Its a brutal swing, especially alongside Tinybones, Bauble Burglar, which rewards mass discard
Able to deal with virtually any problem, Capsize couldn't be dealt with through conventional means (you'd usually have to kill your own creature to have a chance of fizzling Capsize)