Like most Pokmon cards, the value of Crobat V 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 (Darkness Ablaze)
In particular, since you can actively receive damage and fear, if you have this card in the early stages, you can quickly increase your ability value
Morelull #147 Pokemon Lost Thunder Keep track of your collection value over time
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Mutate is an alternate casting cost which means youre still casting the spell, not activating an ability from your hand
Although it's an instant card, which usually means it can be used at any time, this one can only be used during the owner's turn