But Not All Decks Have Four of Every Card The initial deck construction is a starting point, and the real refinement comes through playtesting against various opponents and decks
If you hang around the counterfeit card subreddit, you'll find people asking for fake Aura Shardsa $15 card that isn't on the Reserved List and was already reprinted once in a Commander set
Although, with more players there are naturally more ways to stop certain people from winning, especially when you work together, so there was an extra element of temporary teamwork involved
You don't even need another morph in the deck, you'll be fine with this one
For example, if an effect allows you to cast a sorcery spell with mana value 2 or less from among cards in your graveyard, you could cast Assault this way, but not Battery