These cards always deserve consideration due to their flexibility, which is king in Commander

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If so, see if they can estimate how much they might offer per card and what their payment options are
Goblin decks also have underwhelming card draw as a whole, so Vanquisher's Banner's second effect is vital
Whether or not Ao is leading the deck, youll want a tight curve, with low-mana-value permanents that take advantage of being able to look at seven cards and put two or three of them onto the battlefield