Mystic

The Mystic cards are an Anime-only Archetype used by Blair Flannigan in season 2 of Yu-Gi-Oh! GX.

Description
The cards in the Mystic set all seem to focus on summoning out stronger versions of themselves during the end phase of a turn that they are destroyed in battle.

Only four cards in this Archetype, Egg, Baby Dragon, Dragon, and Revolution have been seen. However, the text of Revolution reveals that Mystic Baby Magician and Baby Knight also exist, and have upgraded forms (that are unnamed).

"Mystic Dragon", the only "Adult" form shown, has the current highest ATK of all Level 8 Monster Cards.

Play Style
Similar to the Chrysalis monsters, the Mystic cards focus on playing weak monster cards and using their effects to bring out stronger versions of themselves. The Mystic cards do this during the end phase whenever one of them is destroyed in battle. This allows for the quick summoning of powerful monsters, such as Mystic Dragon.

Alternatively, Mystic Revolution allows a player to bypass the "Destroyed battle" condition and automatically summons an 'adult' Mystic monster if it's younger counterpart is on the field.