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(2019-05-03) If you cast a spell for another cost "rather than pay its mana cost," you can't choose to cast it for any alternative costs

Similar to the green commander staple, Craterhoof Behemoth, if you have even a few creatures on board, you can wipe one (or more) players out of the game with ease

Not only do you get a damage ping for each spell cast, but Vivi starts to grow and then gives you access to a bunch of extra mana, probably enabling your bigger spells for the blue/red archetype

And making tons of tokens is particularly potent when they ping your opponent any time they die

After all, double strike is a pretty good ability to put into something that protects itself