An issue Yasuo decks have is drawing Yasuo. When you don't have him, it feels really bad to use stun cards. The Monastery of Hirana allows you to use your cards, and then recall them to use later. Because you are going to be targeting a lot of units, Ezreal is used as an additional win condition. When leveled, your recall card will do one damage every turn, and when you target your opponent with Concusive Palm, you'll do an additional 2 damage. Additionally, in the late game, Yone, Windchaser, and Minah Swiftfoot can be reused.