In a private game, you'll just have to put up with your friends harassing you
Some other random goodies you might like: Maddening Hex (this would be HILARIOUS with some doublers), Chandra's Ignition (if you target something with lifelink remember it's the CREATURE doing the damage, so you can gain a TON of life off of this if the board is fairly full, and it's great with a Deathtouch source like Gift of Doom), Fire Covenant (one of the best burn spells ever), and MAYBE a Rionya, Fire Dancer since you've got all those Sorceries
The playful line work and Mews content expression as it holds its tummy evoke the happiest of vibes
Flash and hexproof are two powerful keywords to have on a creature and the number of combat tricks potentially available with this card keeps the power level higher
Ultimately, Mew ex is clearly best utilized against decks that heavily rely on other strong ex cards , as those attacks are some of the strongest in the entire game, meaning that players should absolutely take advantage of them whenever possible
Yorion itself is the ultimate flicker target and is a strong one as long as you have two or three things to target with it