Splinter Twin was a good deck, at some point even the best deck in Modern, but if you look at the numbers, they weren't any higher than decks like Affinity, peak Death's Shadow, or any number of other top-tier decks in the Modern format
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Its dual-type grants it versatility in battles, although it generally serves as a supporting character rather than a central figure in competitive play
It works best with black commons like Infestation Sage and Burglar Rat
Now, with Space-Time Smackdown out for a while, players have been anticipating its follow-up, which seems to have been leaked
Check out the pull rates on all the other cards - they literally vary from 3.09% to 4.64% that's a tiny range