If "Axel" and "Roxas" are used as materials, Riku becomes a lightning rod for your opponent's effects while getting no damage whatsoever: This means that while "Aqua" is busy getting an incredible amount of ATK, Riku can protect her from card effects
Tainted Aether is worth looking at, and I think its a card that actually should get more EDH play than it does, but I also know my capacity to make that happen is limited
Like Mickey, she features the Bodyguard attribute that allows her to enter play exerted and forces enemy challengers to target her before most other cards
negate the Summon or activation, and if you do, destroy that card. Evolzar Dolkka During either players turn, when a monster effect activates: You can detach 1 Xyz Material from this card
[22] Rather than take their form based on their holder's Deck, they take a form relative to the legend that is described