Shimmering Skies is bringing toolbox characters, some impressive Song enablers, and a chance to cast a few free cards
For example, if my starting hand has two one-drops, three three-drops, a fancy item or action card, and a seven-drop, then I will usually keep one one-drop and one three-drop and bottom the other five
Bucky forces discards on opponents whenever the user plays a Floodborn character, and with the Ward ability that blocks challenges, he can be difficult to remove from the board in order to avoid further discards
Stand Out will definitely be a lot more playable than I2I due to its cheaper cost, regardless of whether Worlds Greatest Rock Star is used or not
It adds nothing to the board, and making spells cost an additional mana isnt a particularly desirable effect unless it comes with a creature attached