These cards are locked: 4 Cauldron Familiar 4 Priest of Forgotten Gods 4 Mayhem Devil 2 Scrapheap Scrounger 2 Woe Strider 4 Claim the Firstborn 4 Witchs Oven 4 Blood Crypt Of course, things like Priest of Forgotten Gods and Claim the Firstborn could be much weaker in certain metagames
You might also consider soldier tribal (Sun Quan, Lord of Wu wins games), merfolk tribal, or some wild combination
Sellers making Magic tchotchkes and other cool stuff are no exception
His signature Equipment, Knuckles's Glove (reskined from The Reaver Cleaver), makes Treasure tokens based on the amount of combat damage dealt to a player by the holder
Its somewhat slower than most formats, but it avoids over complexity that some have complained with in some comparable formats
I successfully followed this process and ended up with great looking cards