Due to the standard play not providing a very optimal way of farming cards so you rely on playing events in which you have to win a certain amount to really make a profit and for that those decks arent good enough in my opinion
G wasn't already noted, but Z was, so you'd put one +1/+1 counter on Abstract Iguanart
Planeswalkers represent powerful characters you can summon as allies
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In case Arcades is removed, his Commander deck has cards like Assault Formation to keep the defenders online, and the deck can even "flicker" its defenders so ETB effects like Arcades' own can be used all over again
With vigilance, reach, trample, and haste, Titania can quickly overwhelm your opponent