In Partner decks, Jeska often acts as the finisher that converts board presence into a win
Thats a very simple way to determine which cards are considered spells
It begins by reducing the cost of your instants and sorceries, and if you win the coin flip after casting spells on your turn, it transforms into Ral, Leyline Prodigy, giving you even more cost reduction and spell copying that has revitalized combo strategies in Modern, where it is now a key piece in Ruby Storm lists and works beautifully when backed up by Past in Flames
Cryptbreaker is a card that is a major roleplayer in the deck
Then in the Collector Boosters, there are foil-etched cards
Unfortunately, that isnt true as Team America gains access to Abrupt Decay which neutralizes our disruptive win condition in Counterbalance