The skill Cubic Seed's restriction is so weird.
It basically requires us to have Crimson Nova Trinity, and no way in hell we're getting that card, even if just a single copy.
So I have a feeling there will be a change to it once Aigami becomes unlockable.
Probably becomes "This skill will only activate if your Main Deck contains at least 5 different "Cubic" cards."
Just Main Deck, not Extra Deck as well. And no need to run only Cubic cards, just need at least 5, because having to go absolutely pure just for Vijam is dumb, it would 🔥 the deck's playability instead.
You need to have only cubic monsters, no extra deck (since nova trinity isn't in the game), and only cubic spells and traps in your deck if you want to activate the skill