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Improvise doesn't change a spell's mana cost or mana value
While prior creatures with Disturb would change from human creatures to spirit creatures, Crimson Vow has cards that start as spirit creatures, but become enchantments when transformed with Disturb
Unlike the cards in the main set, Through the Ages cards do not become legal in Magic's Standard format (though they still are if the existing card was already legal there, of course), essentially just making them alternate art versions of those cards
Set Number: There are 131 cards in the Prismatic Evolutions set, and Applin is card number 9
Sure, it also has the break of once per turn end step, but you can gain life every opposing turn with things like permanents, Congregates, or blocking with lifelink dorks