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Even if all you do is counter a 1-mana spell, you spent an extra mana for a better version of Summoner's Bane (better because it counters all spells and not just creature spells)

It can't be destroyed by card effects and can add your current Life Points to its Attack Points every turn

Then, creatures with -1/-1 counters on them cant block

Niv-Mizzet has a couple of ways to make it work, but the concept is very simple

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Presumably, when you jump through whatever hoops allow a creature to become prepared, you're then able to cast its prepared spell