Sylas immediately eliminated several things.
Using
But the problem with that approach was that the Damage of the Arctic Emperor Cobra wouldn't stop there. He had even made it far too strong. The residual Ice-Poison effect would accumulate after the fact. So unless he used Rune Soul to expel the attack every time, they would eventually die to accumulated Damage as well.
Sylas hadn't thought that he would ever run into a problem where his cards were too powerful for the situation, but here he was. If he was careless, he could ruin everything.