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 next cast a creature spell this turn, search your library for a

creature card with lesser mana value, put it onto the battlefield, then shuffle.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o8wxc5rodpb1h02kc3uqk.