Thats not exactly a rare occurrence
Mercenary This is a project that was popularized by Anthony Alongi on the homepage of all things Magic
Choose one
Orzhov, Mono-White, Boros or Selesnya Tokens
Doctor Doom, King of Latveria 40%inclusion 2.31K decks 5.78K decks The Astonishing Ant-Man 64%inclusion 1.72K decks 2.68K decks Namor the Sub-Mariner 40%inclusion 1.11K decks 2.79K decks Taskmaster, Mercenary Mimic 63%inclusion 472 decks 744 decks Crystal, Inhuman Princess 18%inclusion 423 decks 2.34K decks Top Commanders Y'shtola, Night's Blessed 53%inclusion 25.1K decks 47.5K decks Fire Lord Azula 71%inclusion 24K decks 33.9K decks Vivi Ornitier 56%inclusion 20.3K decks 36.4K decks Hashaton, Scarab's Fist 71%inclusion 17.7K decks 25K decks Norman Osborn 76%inclusion 12.6K decks 16.6K decks Alela, Cunning Conqueror 64%inclusion 11K decks 17.1K decks Storm, Force of Nature 68%inclusion 10.6K decks 15.5K decks Ms
That said, it seems one is the limit on great cantrips in Historic, as Brainstorm has been banned there since 2022