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So I'm not thrilled about it

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We'll examine some corner cases in a bit, but the rules of thumb to keep in mind are: First and foremost, the replacement effect has to be in play before the event it replaces

You'll probably want to play a bunch of sagas in a Yuna deck, but if you wanted to get cute with it, you could also take advantage of a sacrifice outlet and cards that come with tons of counters like The Millenium Calendar or Dark Depths

The mana does not have to be used on the spells meaning you can instead use it to ramp out bigger threats or set up extra mana to cast multiple spells