Limiting what they can do lets us be prepared for what they can do to try and answer us, turns off some but not all of their hand, and in the case of Gaddock Teeg, putting a cap on the power level of their spells by shutting down the most expensive ones
(2013-06-07) If a creature with persist that has +1/+1 counters on it receives enough -1/-1 counters to cause it to be destroyed by lethal damage or put into its owners graveyard for having 0 or less toughness, persist wont trigger and the card wont return to the battlefield
I'm a fan
Reckoners Bargain is a newcomer on the block, and while many will instantly favor Deadly Dispute for the Treasure, theres a bunch of decks where Id be happy to take Bargain first
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 Fire Crystal's first ability)
Choosing a Game Concept Think about what kind of world you want in your game