The energy cost, name, and GX attack damage were written in a blue and black stripe with a silver border
Considering that there are ways to Reveillark this (since its a 2/2) and other shenanigans, you can set up all sorts of infinite combos and reanimation loops with the Guide, generating extra mana, death triggers, and more
It might be a little viable to stack many revival triggers and stack Reverse together with Clock Uarak
The Old Back designation refers to the cards reverse-side design, a defining characteristic of the first Japanese print runs, separating it from subsequent localized versions
Eidos for Dos Eidos is another strong starter card for the Deck, so much so that he's usually the main target for Edea's effect
While this only costs two Energy one Fighting Energy and one Colorless Energy this isn't its best feature