If an effect changes the cost of the spell, the amount that player may pay will be more or less than the amount in the spell's reminder text.
Im looking at you, Trainer cards
your opponent can choose 1 monster from their Deck, except a monster with
Away-From-Table Data Analysis & Research SplitSuit comes to the rescue again here with a great video on everything you should be thinking about away from the table: Just as MTG requires time away from the game to study card abilities, metagame, deck composition, etc., poker players can and should work on their game away from the felt
When it dies, as all creatures must, it'll come back to your hand for free, with no additional investment of cards or resources like mana