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Im also sure you can find hundreds of other really, really bad cards that are equally worth criticizing

How to Xyz Summon If you want to Xyz Summon, you need some face-up monsters on the field with the same level

Promo Info EXTRA BOOSTER CHAIN OF LIBERATION [EX-08] CLOSECLOSE EX8-068 U Option Deep Savers Color Blue Form - Attribute - Type DS DP - Cost 2 Digivolve Cost 1 - Digivolve Cost 2 - Upper Text While you have no face-up security cards, you may ignore this card's color requirements

Mutavault on the other hand is only a 2/2, but satisfies the good and cheap part by being only one mana to activate

It did not seek to generate card advantage any other way (no Nekrataals)

This would fit well in a Tails-centric deck