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|New Rating system (RIP Greven)|
Power | Flexibility | Synergy
3.0 - Total Bomb | 3.0 - Effectively Colorless | 3.0 - Best with others
2.0 - Play this card if you can | 2.0 - Splashable, 3 color | 2.0 - Better with some decks
1.0 - Filler | 1.0 - Playable in 2 color without problem | 1.0 - No special interactions
0.0 - Unplayable | 0.0- Needs 10+ colored sources | 0.0 - Sideboard

LSV pronounced this unplayable early in the format on LR. However, I think that's something of an exaggeration.
It's a build-around, and the card you need is Throwing Knife (note: it targets even if you choose not to sac it!).
There are others as well.

0.5/1.0/3.0

My favourite is Separatist Voidmage. And I met a prerelease sealed deck which had this, Jace, and Whirler Rogue.

Reid likes this card, and picks it highly. I must say I like it too. It should be sided out against some decks, but many decks in this format don't have a lot of ways to kill a Willbreaker.