Talk:Coral Guard, Blizz/@comment-27360363-20140501062947

Four is very easy thing to hit ._. i've seen it before while trying to hit six and seven, and it's very easy. The worst you could get is four. Five is the most common and also relatively easy. Six gets annoying at a small chance. Seven is by far the only one with an annoyance especially if you lack grade 3s in the deck.

Not to mention there seems to be a large jump in probability from six > seven. Sooooo yeah four is practically a 99% chance of succeeding .-.

I'd say six would be enough for something like this.