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Well, no worries, weve all been there

Commander products have repeatedly introduced relevant new Constructed and Cube-relevant cards (and only True-Name Nemesis looked really awkward in a Commander release)

Most effects that let you look at the top of your library and cast creatures from it in green are already at least four mana

Enchantment Color tag templates(None) Shark Typhoon Whenever you cast a noncreature spell, create an X/X blue Shark creature token with flying, where X is that spell's mana value

Players battle each other with decks comprised of monsters, Spell cards, and Trap cards

That's a bit vague, so to put it simply: Decide which of these you want to play as