The app offers something called "rental decks" as well
Currently, TCGPlayer shows this Mega Darkrai ex priced at $440, with some potential listings reaching nearly $700
It puts a clock on your opponents and can amass doom counters faster than players may be aware of
You need to have cast it and kept it out long enough to complete a dungeon, pay three mana, hope you hit a spell you can cast, and cant even play lands from it (as theyre not cast, simply played)
It was originally a game loss, but its just a warning today
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Wind Crystal's first ability)