Both standard and stand aloneAre these cards being designed as a stand-alone product, or is it being designed within the context of Standard format?
Iron Bundle is an interesting one; assuming the attack does nothing if you have fewer than 5 cards in hand, it could be tough to consistently be setting it up without losing important resources. On the other hand, a single attack plus a Colress sets up your Mirage Gate, letting you transition into other attackers right away.
Skeledirge is a super fun card, and I've made a fake card with a similar ability in the past. Assuming we're standard-format minded, though, I have to disagree with the comment about its power level. Nearly every deck's default attacks OHKO it; Spit Innocently, Techno Blast, Miracle Force, Rolling Iron, etc.
For a card that is clearly above the power curve, though, Giratina ex stands out. Lumineon V is a card that sees a lot of play, and it searches exactly 1 Trainer card, which also has to be the Supporter subclass. Even ignoring the Energy, getting any 3 Trainer cards you want would probably alter how players build their decks. Given it is meant to be a support Pokémon (i.e. all decks can use it), though, it could be fine? People tend to like staples including Quick Search Pidgeot, Cosmic Power Claydol, and Shady Dealings Inteleon; but I'm not sure how much of that is based around the risk and reward of using weak basics until they can evolve and provide their utility.