This is one of those cards that could tank if it was ever reprinted, but I doubt it will be
Right now on TCGPlayer, this card is valued at a market price of $16.24 USD
With this effect you can use Armageddon Knight like a Pseudo Stratos to search Dragon
"Authorship" means the creator, designer, culture, or source of origin of a lot of original comic art or original artwork for a toy, trading card, or game that is specifically identified in BOLD and CAPITAL type in the lot's current catalogue or on the lot's description on the auction's Index Page, but not including supplemental text or information included in any other descriptions
There are many cards that use convoke, with most being found in green and white, and have very large mana costs that encourage convoking