A 4-mana 6/6 would be a 4.0 already, and this has some nice abilities tacked on. It’s not strict upside, as it does limit your ability to cast noncreature spells, but the onus is on the opponent to deal with this rather than you. Plus, if you ever get to put this into play off something like Burglar Rat, the game just ends on the spot.
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