It's worth noting that these two lands are part of a five-card cycle, one for each color
There is a BR aggro Pirate deck and a UB control deck that is all about controlling the board until you can drop some big Sphinxes from Amonkhet
It can also do all the flash tricks like block out of nowhere and play at the end of a turn and then swing on your turn, and a 3/4 for four is pretty nice on curve
Since the cascade keyword lets you move down your deck until you find a valid card, you will always get the opportunity to use your free second spell.
Also, the actual cost of this blue instant is only 3 mana, which makes it much easier than other free counters to just cast straight up
While commanders like Drizzt Do'Urden, Gavi, Nest Warden, Jinnie Fay, Jetmir's Second, Jolrael, Mwonvuli Recluse, and Lord Windgrace give you tokens that are Cats (or Cat Warriors), theyre usually asking you to build around other strategies, not cats as a theme