Niv is always going to generate some value for you
This is often referred to as a 0-card combo since you dont need to have any specific cards in your hand to power out a win
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We also can take advantage of powerful ramp like Somberwald Sage and Nikya of the Old Ways, and it also lets us break the symmetry on noncreature hate cards like Ruric Thar, the Unbowed and Thalia, Guardian of Thraben (if White)
III Ecliptic Growl Draw a card if you control the creature with the greatest power or tied for the greatest power
Fans shouldn't be fooled by the high market price, though