Since it's a best of one format, Sky Striker is especially powerful as Control decks tend to be in that kind of format
The existence of Mist Valley Apex Avian is another testament to the status
Its also another extra-combat spell for Etali, Primal Storm and other decks that lose out by free-casting traditional extra combat spells during combat when most of them do nothing thanks to the wording usually being after this main phase (which means in combat the spell does nothing)
Other cards in your deck should work to give you advantages
I can definitely understand people not putting Yawgmoth, Thran Physician in their top five list as its only played in one deck, which isnt a dominant player in the metagame either, but the card makes the archetype and there arent too many good mono-black creatures in Modern right now
Despite their thickness, these sleeves maintain a slim profile that keeps your deck manageable and easy to shuffle