Then, once it's solved, it gains the ability to sacrifice itself to let you cast creatures from your graveyard for the turn
The same is also true for your hand, graveyard, and library, so youre hardly completely protected from interaction
Its easy to write these concerns off as nobody should actually buy these cards under the assumption that theyre going to maintain their value, its just a game, what did you expect, paying $500 for a piece of cardboard? or even, if you have enough money to blow on $100 Magic cards, then money shouldnt be enough of a problem for you for this to matter. The problem, of course, is that people grow and circumstances change
(2017-08-25) To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions