While Dialga ex comes with two attacks, neither are impressive
If you lose control of Yuffie or it leaves the battlefield before its last ability resolves, you won't gain control of the target noncreature artifact
Add the cards Shift ability to the mix - which enables players to place it for four ink, instead of the usual seven, if they already have a Milo Thatch card on the board - and Milo Thatch, King of Atlantis proves to be a rather formidable Lorcana emerald card.
destroy those targets, and if you do, inflict damage to your opponent equal to the highest original ATK among those destroyed monsters (your choice, if tied)
The user endures any attack with at least 1 HP
I ran Marrow-Gnawer for a time, but offloaded it when I realized that I was bored by the deck