Cards that help shift a current format/metagame out of strategic lassitude will make the cut here
"Ruby Carbuncle", "Emerald Tortoise" and "Amethyst Cat" being Level 3 monsters allows them to be used with "Cherubini, Ebon Angel of the Burning Abyss", easily sending these 3 "Crystal Beast" monsters to the GY for the Summon of "Rainbow Dragon" (or send "Crystal Master" in order to Special Summon later)
In Pokmon, for example, card advantage is not the most important thing because players are constantly drawing cards and replenishing their hands (in fact, some decks can even draw 20+ cards in one turn), but it is crucial in Magic: The Gathering and used to be very important in Yu-Gi-Oh
MTG Arena players only need to know about Through the Omenpaths cards, and paper players need only care about the Spider-Man ones
Designed for Space Cadets (2012 byStronghold Games)