Prices are updated based upon Magic Marvel Spider-Man listings that sold on eBay and other marketplaces
You can't play with these cards in Standard, but they are, of course, legal in Commander, which is more widely played
But with that ratio, and with the drop rates in both types of boosters, I estimate that the ratio of mythics to MAR cards is about 3:2, meaning that for every two copies of a particular MAR card, theres three copies of a particular in-set mythic
You get to decide when to cast it, which will effect whether or not you get a card you can cast
Trostani being legendary hasnt hurt the five-mana creature as much as I thought it would because your opponent will assuredly have to remove it from the battlefield to be able to win the game, which makes having a second copy in your hand less of a drawback
If the problem persists you may need to use a tad more muscle or work on your aim