Essentially, if you have a full party with all four of these on the board, you can pay one white, one blue, and one black mana to give the Warrior lifelink, deathtouch, and make him unblockable (deathtouch and unblockable at the same time has no real use, but thats still OP to think about)
Of the two, Kida is certainly the stronger one
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However, if you want to complete the set, it can be a bit of a trek
This is a great example of that
Contents: 3 Final Fantasy Play Boosters (14 cards per booster) 6 Traditional Foil Scene Cards 6 Art only scene cards Display Easel A Play Booster contains: 14 Magic: The Gathering cards per booster 14 cards of rarity Rare or higher 35 Uncommon cards 69 Common cards 1 Land card