Like most Pokmon cards, the value of Mew 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 (HSTriumphant)
It turns all of your noncreature tokens into land creatures, letting them tap for mana
Madame Web, Clairvoyant Saffgor: Art is everything I wanted from a Madame Web card, look at that Ben Reilly Jackal and Julia Carpenter Web, just gorgeous
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While Twilight Masquerade's best cards continue to get more expensive, don't fall victim to the hype of cards that suddenly spike in price
It's rare these days for a deck to be as good as the Blacephalon deck is without the main focus being around a VMAX or GX card