Odds of Hitting Consecutive "Multi-card Cards" with Thrumming Stone, Assuming 30 Copies Now, a 0.003% chance of hitting five times seems bad, right
2: Target creature becomes a Treasure artifact with ", Sacrifice this artifact: Add one mana of any color" and loses all other card types and abilities
All you have to do is find a filtering mana ability that produces at least two mana to go positive
I love this pair so much, and they are cheap on the secondary market as well, too, by the by
Sometimes you'll even use her -1 to drain your opponents or her 0 ability to exile a problem creature or re-use one of your creature's enter the battlefield (ETB) abilities
Will only costs three mana, so you want to get Will on the battlefield as quickly as possible to start taking advantage of its effect in the early stages of the game