You may choose only a creature that's already on the battlefield
More specifically, I want to talk about why Ive been drafting so much green-black in the format, and why you should too
An effect to Special Summon itself as an Effect Monster, with a unique bonus after being Summoned
Things like a basic-evolving Ho-Oh BREAK are easier to build around, but a competitive Greninja BREAK deck may need four copies of Froakie, four Frogadier, four Greninja, and four Greninja BREAK to be as consistent as possible
Other improvements include an updated UI and more deck management, though it has a surprisingly limited card pool of only 1000 considering the time of its release
Here are some of the best cards in the set