Usually for simplicity of message, and for inventory reasons, the store owner wants to give away one type of booster
Elsa is one of the most popular Disney Lorcana characters, and many have speculated that any of the cards featuring this Disney Queen could continue to be highly sought after
14 Beast, Tragic Hero You Can Hear His Heart Breaking
It could also buy you enough time by unsummoning a full horde of attackers against your slow board, allowing enough time for you to catch-up blockers to your opponent's fast start
As another example, if at the start of turn six you have five cards in your inkwell and hold a two-drop, a three-drop, and a five-drop, then just cast your five-drop and dont add anything else to the inkwell at this point
Putting It All Together is from the upcoming mystery-themed Whispers in the Well set, which has its pre-release this Friday, November 7th, and retail release a week later on November 14th