When chaining several noncreature spells together, if Shu Yun is given double strike, it is possible for it to grow large enough to take out a player in a single attack via Commander Damage
It's great fun for the winning and you can recur and trigger and then pump what you recur
With the right reanimation spells or flicker effects, Author can keep your opponents' yards in check while picking up extra spells along the way
Original duals are at their best when fetched early, securing both colors without sacrificing speed or life
Make sure to add flicker cards like Thassa, Deep-Dwelling that specify the creature returns under your controlnot its owner's controlso that you can keep the recruited creatures forever
Note that their ultimate is 8 loyalty, so you could drop them, go to 6 loyalty on turn three, and then on turn six, when you have 8, you can ultimate