Most of The Ur-Dragon's power is tied up in its eminence ability, a free discount to all your already-expensive Dragons
any battle damage your opponent takes from attacks involving the targeted monster and their monster is doubled for the rest of this turn, also destroy this card
That of course is why the Heraldics see play for a more sinister reason, as alongside 2 copies of Evilswarm Ouroboros, we can remove all 5 cards from our opponents starting hand, while also ending on Shatter Stream & another Rank 4 of our choice
So when The Pokmon Company announced a mobile version of the TCG that allowed you to not only play the game, but also open booster packs, collect cards, and create collections with in-game binders, my ears immediately pricked up
Your opponent reveals their hand, and you put a Basic Pokmon you find there onto your opponents Bench