Those creatures don't untap during that player's next untap step
One of the most popular deck archetypes in casual town is "Aristocrats" where you sacrifice a dork to a free effect like Viscera Seer, then trigger their death with Blood Artist, then bring them back with Bloodghast dropping a land
Thats not the best package, but its not the worst, either, and if were getting a lot of value out of the Dinosaur-ness of the card, its not embarrassing
As for the cards themselves, Mew V can deal 30 damage for each Energy attached to both itself and your opponents Active Pokemon
If you want to get 20 or more Pokmon cards graded at the same time, choose the Bulk Grading option thats $15 USD per card instead
A PSA 10 example also sold for $550,000 at Heritage in late 2025