Vivien, Monsters' Advocate
You may look at the top card of your library any time. You may cast creature spells from the top of your library. +1: Create a 3/3 green Beast creature token. Put your choice of a vigilance counter, a reach counter, or a trample counter on it. −2: When you cast your next creature spell this turn, search your library for a creature card with lesser converted mana cost, put it onto the battlefield, then shuffle your library.
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