Chaos Dragon is a cheap 4/4, which is exactly what the deck needed, and Thrakkus is just plain nasty with double strike
Let their own assumptions about the kind of deck that would play a card like this distract them so you can enact your master plan

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When Bloomburrow was announced earlier this year, like many others, I was excited about the idea of a Redwall-esque setting filled with cute creatures
Special MTG Rarities Admittedly, most of the time, you'll be dealing with common, uncommon, rare, and mythic rare, and life will be nice and orderly
When this artifact is put into a graveyard from the battlefield, draw a card