Killing Wave

[Lespend]

With {blood artist} on the board Can I {killing wave} for zero and choose to sac all my creatures to do damage, or do I have to give a value to x?

[BadLuckIrish]

X can be 0. But with {Killing Wave} id at least do 1 so ur oppenent would pay 1 life to keep his while u sac urs

[Lespend]

Yeah, the goal is to have a few {blood artist}'s out hen I do it, the though was to hit with the sac, and still have mana to cast other thing but you're right. Mostly confirming a theory here...

[BlackJester]

You could, but you may as well sac them to do something useful.  Like {Bloodflow Connoisseur}.  But if it's part of a bigger plan, I gotcha.