Colossochelys

Colossochelys is an Earth attributed card made by DinoFlame. Like many Earth card, it has a strong focus on defense, allowing it to endure heavy hits.

Tortoise Shell
This card is immune to paralysis and attacks deal 50 less damage to it.

Withdraw
This card does not attack this turn. While this card remains on the field, all damage to it is reduced by 30. This effect can stack up to four times.

Tortoise Bite
Tortoise Bite is an average attack with no further effects.

Origin Information
The "claim to fame" of Colossochelys -a native of the Pleistocene- is that it is the largest land tortoise/turtle. In terms of tortoises/turtles overall, though, it was outsize by the aquatic Protostega and Archelon. Visually it would have looked very much like an up-sized Galapagos Giant Tortoise, and it likely had a similar lifestyle as well.

Using Colossochelys
One very notable feature of Colossochelys is its imunity to paralysis. This makes it very useful when facing cards that inflict paralysis when they're played, such as Stegosaurus and Tyrannosaurus rex. Also quite obviously something you'll want to take advantage of is its defensive abilities. With Tortoise Shell, Colossocheys should easily be able to easily take an attack from an equally classed card, or just hold on against a stronger foe. This gives you a perfect chance to use Withdraw, and strengthen its defences even more. Upon further uses of Withdraw, you can eventually render Colossochelys immune to any attacks dealing less than 170 damage. Be aware, though, that Colossochelys' defenses can be broken by certain abilities, pure power, or by forcing Colossochelys to retreat. For that reason, you should be cautious of what cards your foe might have when using Colossochelys.

Defending against Colossochelys
Your best bet to take down Colossochelys is to either take it out right off the bat with a really strong attack, or by using something that can get past its abilities. If it builds up its defenses, both of those options are still valid, although the former becomes a bit more challenging. Lacking those options, though, you can also reset the effects of Withdraw by forcing Colossochelys to retreat.