So we only ended up with three Dragons on the list, although Omen being a strictly Dragon mechanic (for now) maybe also counts
Having a wide variety of different creatures (Zombies (12) outnumber Thrulls(6), Kolbolds(7), and Merfolk(9) (Goblins edge out on 13))
coming up with the name seemingly on the fly, the name itself sort of struck a chord, and developers remembered it for later use
That Upper Decks own developers disagreed so strongly with their case shows that these claims should never have been filed in the first place." Brian Lewis, Legal Advisor for Ravensburger: We were steadfast in our position that Ravensburger has conducted themselves with the utmost integrity
Mobilize was first released in the set Portal, illustrated by Rebecca Guay
The player then stacks those monsters in a single zone and the Xyz Monster on top of them, which are referred to as Xyz Materials in the TCG / OCG and "Overlay Units" in the anime and manga