In this deck, a card like Gravebreaker Lamia can set up the next reanimation target, and you can also sacrifice sagas in their final chapter or enchantments that make you lose the game like Demonic Pact
In the Digimon canon it should be supposed to be sort of rock-paper-scissor, while as far as I got, in the japanese game it's A-B-C loosely tied to attributes, but A(against "vaccine") attacks are always the strongest and C(against "virus") the lowest, but C attacks set the opponent's attack to 0
It does have Dimir Midrange, however, which seems like the most likely existing home for Oculus
If you're interested in the how rarity can impact the value or impression of a card, we've got a few guides to get you up to speed, such as Magic: The Gathering Cards, Digimon Cards, and Pokemon Cards