If you're lucky enough to own (or find, somehow) one of these Professor Program-stamped Voltorbs, you're looking at $1000 just for an ungraded card - with some on eBay for ridiculous amounts right now
The card was originally printed in a set infested with werewolves, but works with Clive, Ifrit's Dominant or any transforming summon
You can also cast Zacama, Primal Calamity on the cheap and still untap all of your lands to have access to even more mana to use to cast Dinosaurs or activate Zacamas abilities
It has to attack every turn, which increases the odds of it dying early by a lot
and the third most popular game at hobby shops (after Magic and Yu Gi Oh).The booster packs when were kids didn't even have any of the 150 Pokemon that were out at the time
This particular card can be found for anywhere between $20-40, depending on platform, grade, and quality