Banish that monster
This design plays into its dual type's strengths and weaknesses, making it highly resistant to Electric and Poison moves, yet vulnerable to Water and Grass attacks
Actually, there's no ethical or acceptable reason to make "proxies" to pass the light test, bend test, and other well-known tests to weed out fake cards because there's no ethical or acceptable use of proxies that requires the proxy to be as similar to a real card as possiblea Sharpie on a basic Island does the job just as well and without any of the legal and moral issues
To make the most of casualty, you'll want to fill your deck with creatures that reward you when they die, like Sinister Concierge, or tokens you have no attachment to, like decayed Zombie tokens
it can make a second attack during each Battle Phase this turn, also, if it attacks this turn, your opponent cannot activate Spell/Trap Cards until the end of the Damage Step