This means that silver-bordered cards are not legal in Commander they are not covered by the Comprehensive Rules and not legal in constructed formats
At six ink, Tamatoa is a mid-cost, game-swinging play, backed by a sturdy five Willpower
This deck features 20+ counterspell spells (instants), and in addition a number of your creatures add additional counter abilities, such as Voidmage Prodigy, which can turn each of your wizards into a counterspell
She crash lands, busting a Commander, threat, or problem land like Nykthos or Urborg
So, it's basically Abyssal Specter with 2 toughness but better evasion
Nine slots of seven cards is 63 cards, which leaves room for an appropriate number of lands