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)
"Lantern" does not have a Flip effect, but instead has a defensive effect that can be activated from the hand, so by salvaging it with "Ghostrick Dullahan" or "Ghostrick Alucard," it can contribute significantly to your defense
Snom has the following attacks: Gnaw - 20 damage
It comes off as one of those mana-dump activated abilities that Wizards puts on one-drops so that you can do something with them turn seven
Now sporting a new visual icon to denote their status as Pokmon-ex, these cards had a new variant emerge in Gen 9: Terastallized Pokmon-ex
anime, not all of them have been as successful in the real world as they were in the series