Despite it being an uncounterable creature that you can cast at flash speed, one of the most common things to do with Hullbreaker Horror is cheating it into play with a card like Polymorph
You may be able to fix this by highlighting that character and changing the kerning (in the Character panel) to Metrics
There are no colourless Casualty cards.
Gandalf is a Wizard, so we might want to dip into some Wizard synergy in the deck too
Unlike EX Pokemon, which were usually Basics regardless of if they're evolved or not, M Pokemon still needed to be evolved onto an existing EX Pokemon to play M Rayquaza EX, you needed a Rayquaza EX in play to evolve
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Raphael, the Muscle: The damage is dealt by the same source as the original source of damage