Cards like Hangarback Walker and Walking Ballista are useless, Gemstone Mine is very bad, Aether Vial gets stuck, Counters Company loses half its combo, Pyromancer Ascension never goes activeall sorts of cards that see play become either useless or much worse
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Often, you'll mainly want this to clone a big elemental token, but you be complaining about drawing cards, wiping weenies, and making treasures as well
She importantly survives Let the Storm Rage On and Teeth and Ambitions, which probably makes her a bit better than Gaston
What About Direct Damage Abilities Like Vial Smasher or Niv-Mizzet, Parun