They are found in Battle Pack: Epic Dawn (including the Battle Pack Tournament Prize Cards ) and Star Packs
Perhaps in hindsight the idea that energy would be challenged by the overall power of Modern was undercut somewhat by printing all these new Modern-tier energy spells that players could immediately combine to get that inherent flexibility buff
Interrupting "Imsety, Glory of Horus"'s search is a two-for-one exchange, while destroying "King's Sarcophagus" prevents any of the "Sons of Horus" from being Summoned.
The Pokmon franchise was created in Japan in 1996
In these cases, it might be worth it to carry three boxes: one filled with $0.50 cards, one with $1 cards, and one with $2 cards
During Urzas Saga design, we toyed around with different cycling costs but realized that the mechanic was rich enough that only a single fixed cost (which obviously turned out to be 2) was necessary