If a noncreature artifact enters the battlefield under your control, the ability will trigger
Prowlers Helm
If you do, scry 2, then draw a card
These are powerful, and running enough of them can mitigate the need for the cards on this list, but theyre so flexible they would naturally top the list (I do have a few spells that target permanents other than artifacts, but they still say artifact)
Outside of removal, there's other powerful spells like the game-ender Exsanguinate, and the value engine Lingering Souls, both of which work well with Y'shtola's abilities due to being greater than mana value 3 when cast
For example: They forgot to print Volcanic Islands and Circle of Protection: Black, which means you will never find any of these two cards in Alpha