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
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"Your opponent can't play Digimon by effects" is an effect that prevents your opponent from playing Digimon by effects
Cards that help shift a current format/metagame out of strategic lassitude will make the cut here
Designed for Space Cadets (2012 byStronghold Games)
"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)