mtg card legality

mtg card legality Can someone explain to me why this isn't legal? Is there any other cards that do the same ability? Understanding the Legality of Cards

Name: mtg card legality Can someone explain to me why this isn't legal? Is there any other cards that do the same ability? Understanding the Legality of Cards
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SKU: 15992172487
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SKU: 15992172487

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Description

Ariel has 3 Strength, an impressive 8 Willpower, and 2 Lore when Questing too

From legendary and super rare cards from The First Chapter making a much anticipated return to some unconventional reprints that will probably still never see play, there's a ton of new combinations that can come from the Fabled Lorcana set

While inefficient at four mana before increasing X, the lifegain is a nice way to counteract the decks many cards which require life as an additional cost