Polyonax

A dubious ceratopsian created by Clockwork to be the ultimate tank.

Nomen Dubium
This card can not be targetted by Prehistoric cards.

Master Guard
This card takes only 5% of damage from all attacks and abilities, and is immune to all status effects. It can only be damaged if it is the only card on its side of the field.

Bastion Burst
This attack deals no actual damage, but it destroys every Fire attributed creature on the field.

Origin Information
Polyonax mortuarius is one of the few Nomen Dubium cards to not have a valid counterpart, or at least be a tree. Polyonax may be a legitimate genus, but is known from poor remains, and thought to be a possible Triceratops synonym. It was also for a time mixed up with hadrosaurs, and thought to be a synonym of Trachodon, itself a dubious genus.

Using Polyonax
Polyonax is best used not as your main trump but as support, acting as both a stalling tactic and a way to keep Fire attributed cards off your opponent's field, allowing you to both evade their high attack power and to effectively use cards with crippling weaknesses to the element. It should never be alone on the field, as, despite its amazing defences, it's completely invulnerable while it has an ally. Polyonax is at its best when deployed against a player who specializes in the Fire element, leaving them the difficult decision of sacrificng some cards to take yours, or playing it safe with the few other ones they have. A particularly potent combonation, if you have the resources available, would be stalling with Polyonax as your entire hand is one-by-one defeated, then playing Omega T-rex and using Chaos Genesis. The ensuing Ultimasaurus would be an absolute game-changer- assuming, of course, that your foe doesn't have a Polyonax as well.

Defending against Polyonax
Don't actively try to defeat Polyonax. If you get the opportunity, you should damage Polyonax, but over all, short of a field-destroying move card or ability, you aren't going to be doing anything against it until it's the last card in your opponent's hand. Just keep your Fire attributed cards off the field unless they have an ability that makes them immune to Bastion Burst, and roll with the punches.

Trivia

 * Polyonax's Lightning attribute is inspired by the anime and game series Dinosaur King, in which ceratopsians are all Lightning elemental.