You can use these cards on an end step before your turn if you need a land, but youll generally want to save them until creatures that get extra value from noncreature spells are on the battlefield
Poking around a bit, I found quite a few graded cards posted on eBay, and while sellers were asking higher-than-average prices for those cards, one thing seemed pretty obvious: The newer a Magic card is, the less likely grading it will have a significant effect on its value
Yes, sometimes youll whiff on the activation, but the activated ability is just icing on the cake, and in 45+ creature decks, you should often be hitting an extra card
Youre relying on being ahead enough to force them to do a lot of blocking or on your opponents to attack the bejesus out of each other
The Presentation Blastoise card sold in January 2021 for a cool $360,000 / 260,000 at auction, and while it's since been surpassed, at the time it clinched the title for most expensive Pokmon card ever sold