Mist-Syndicate Naga Mist-Syndicate Naga is another instance of a snowballing card that will take over the game on an empty board or with a single ninjutsu

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The fact that it is a single use card also makes it a better card design, it will not slow down games overly and it will provoke more difficult choices
For example, a Base Set Venusaur Holo graded CGC 7 sold for $86 in a recent PWCC auction
More specifically, the mechanic showed up on a lot of vampires and vampire-related cards in Shadows over Innistrad
The Izzet Phoenix deck has two copies of Expressive Iteration, which is banned in Pioneer, but if the deck is played in its entirety it will be legal in the format