Like most Pokmon cards, the value of Mew ex depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Celebrations: Classic Collection)
So she's really living or dying off of her draw and while I do like being able to quest and draw each turn, at only 3 Willpower, she's not going to be sticking around on board for long
You can always summon a stronger ritual monster to fight in case your main monster is going to die
When you then throw in cards like Apex Devastator, which is suddenly a six-mana 10/10 with four cascade triggers, youre basically constantly generating value
This will help improve immersiveness
The Ancient Guardians booster set introduces a trio of brand-new strategies, and Duelists will find lots of useful returning cards to help them build Decks around the new themes