With the possible exception of that last card (only because of its "win the Match" part), why are those "Unhinged"? Upgrading equipment sounds like a cool idea.Mystical Blue Moon
Equip Spell
Effect: Activate only by sending 1 "Mystical Moon" on your field to the graveyard. Equip this card to the monster that was equipped with the sent "Mystical Moon". Increase the equipped monster's ATK and DEF by 500 points. The equipped monster is not destroyed as a result of battle with a monster with the same ATK.
Mystical Harvest Moon
Equip Spell
Effect: Activate only by sending 1 "Mystical Blue Moon" on your field to the graveyard. Equip this card to the monster that was equipped with the sent "Mystical Blue Moon". Increase the equipped monster's ATK and DEF by 500 points. The equipped monster is not destroyed as a result of battle. The equipped monster does Piercing damage to the opponent.
Eclipse of the Mystical Moon
Equip Spell
Effect: Activate only by sending 1 "Mystical Harvest Moon" on the field to the graveyard. Equip this card to the monster that was equipped with the sent "Mystical Harvet Moon". Increase the equipped monster's ATk and DEF by 1000 points. The equipped monster is not destroyed as a result of battle. The quipped monster does Piercing damage to the opponent. If the equipped monster reduced the opponent's life points to 0 as a result of battle in a single attack, and you have "Mystical Moon", "Mystical Blue Moon" and "Mystical Harvest Moon" in your graveyard, you win the match.
With the possible exception of that last card (only because of its "win the Match" part), why are those "Unhinged"? Upgrading equipment sounds like a cool idea.
You're missing the point of "Unhinged", then. Unhinged cards are really wacky cards, probably ones that have paradoxical effects or ones that completely bend the rules. They are not simply "useless" cards. "Gate Guardian" is probably the most useless of them all, yet it still exists as a real card. Unhinged cards are ones that should never be allowed into the game on the basis that they're incredibly overpowered (providing a missing link to a killer chain, perhaps) or break the rules so completely things would just be a mess.
Your cards do none of these things. They look like perfectly valid cards, even if only for casual Decks. Since LV monsters exist, this upgrading aspect of cards is no longer amazingly different. They'd be allowed to exist as real cards, and that's the main point. Unhinged cards wouldn't.