Ooh. A feint card with no normal mana cost. It's a natural thing to try once you say it. It'd get frustrating if you're not able to get past your opponent's blockers, though, but I guess that's the risk you take putting this card in your deck.

I'm going to go out on a limb and assume he meant to give this a normal cost as well.

Nope.

Then I'm going to suggest you give this a normal cost as well.

While the "just a Feint cost" trick might be something worth exploring down the road, I don't see a good reason to execute that idea on a mundane beater in the first set of a block. You're just wasting spice that can be used later to greater effect.

New concept.

In looking at the bigger picture, I'm edging dangerously close to "too much feint" territory already, so all things considered, saving the trick design for later probably isn't a bad thing.