Honorable Mention Voja, Jaws of the Conclave This five-mana 5/5 with three abilities, ward 3 to protect, trampling evasion and vigilance to hold back and swinging
It lurks in a great chasm in the Underdark, called the Vast Oblivium, and it considers itself the master of all it surveys
This is really, really jarring, especially after you've just seen the low anime framerate cause the drawn D-Wheel to jerk onto the track in a rapid series of 1-metre hops
To explain seriously, this monster has an effect that allows for a once-per-turn quick-effect removal during the turn it was Special Summoned, and an effect to detach one Xyz material to search for "Exosister Pax" or "Exosister Vadis"
This card uses the same strategy as Pikachu ex, while being more flexible due to its typing