Zamriel wants you to equip your creatures to make them indestructible during your turn, so being able to cast equipment spells at instant speed and attach them to your creatures when they enter the battlefield makes Sigardas Aid feel like an essential card
In fact, if you were to employ this strategy at the Pro Tour, so long as you did a good job drafting, building your deck, and playing the games, you'd have a perfectly fine chance to do well
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Meanwhile, Demona makes for an excellent one-of in this deck, forcing opposing characters into resting, acting as superior draw, and letting you swing for an incredible board removal turn
They may not be inherently powerful cards, but offer enough individuality that MTG and D&D fans will be after these