If an effect allows you to cast Sundering Stroke without paying its mana cost, you can't choose to cast it and pay its cost unless another rule or effect allows you to cast it for a cost
You create a number of 1/1 blue Faerie Dragon creature tokens with flying equal to the result
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(Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.) Company: Wizards of the Coast Series: Dragons of Tarkir Item Type: Single Card Release Date: March 2015 Brand: Magic the Gathering UPC: Stock #: 104313 Our Guarantees to You, Our Valued Customer
If this causes the total toughness of creatures you control to change (perhaps because you control a creature whose toughness is determined by the number of cards in your hand), that new toughness will be used to determine the cost reduction
That said, I also realized something when putting this article together: I should probably be playing Mistveil Plains, as its a white source in a three color deck, and invaluable when combined with Sunforger
