New custom cards: Des Slime and Assistant Magician

This week, I came across a post in the custom Yu-Gi-Oh! cards subreddit posting some Slime support, which reminded me that Revival Jam's TCG effect is a pale imitation of its anime effect, so I got the itch to create Des Slime to fix that. As it provides archetypal support for Slime monsters, I figured it might be appropriate to errata Revival Jam and Jam Defender with archetype conditions making clear that they are indeed Slime cards per their Japanese names. Those will also be available with Des Slime. 

I also continued with my typal battle searchers, this time whipping up Assistant Magician to take the slot for Spellcaster monsters. I opted to deviate slightly from the established pattern of Level 3 or 4 monsters to make it Level 2 and allow some synergy between it and Apprentice Magician, Spellcasters' existing but limited searcher.