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You pay the cost, show the card to your opponent and let them read it, then you use its ability and put it into the discard pile

An Aura put onto the battlefield this way doesn't target anything (so it could be attached to a permanent with shroud, for example), but the Aura's enchant ability restricts what it can be attached to

Otherwise, draw a card

But despite the emphasis on spells costing four mana or more, I think that the most aggressive versions of UR are the most powerful ones, especially if youre not splashing in other colors

These villains also expand our mana curve, so we add Summon: Primal Odin as a potential one-hit-kill in a list with so many board interactions, and close the top of the curve with Ardyn, the Usurper, which interacts with Resentful Revelation and Memories Returning Emet-Selch, Unsundered also fits into the cards that interact with the Surveil/Mill, allowing us to reuse all cards from the graveyard if transformed

This will help you reliably cast your spells while ensuring you have enough cards to complete your deck