As an aside, when one is speaking about flipping for a creature off the top of the library, that's specifically a "Polymorph" effect, and for a non-creature, it's a "Scramble." Creature The classic enablers for Polymorph strategies are unique in that they contain an artifact, meaning Blue as a color can tap into their tutor-ability both as Sorceries, and artifacts
However, if it doesn't include one of these features, it's legal
Gamble Gamble is a cheap red tutor that puts you down a card and might just discard the very card you tutored for
Magic: The Gathering kicked off in 1993 with its first printing, known as Alpha
Its the only classification with its own ruleset, and it isnt mentioned on the cards themselves