Make everyone use multi and all? That's probably because there's NO reason to use single on a hitter when you can target all. Also Burns, what he meant by the 1/18 chance to "catch" a third freeze is this. Three birds, first two freezes automatically hit the wall, third one looks for a target and has a 1/3 chance to hit an empty spot. Assuming that it does hit one of the two empty spots it then has a chance to hit the other empty spot, (a 1/5 actually, since it says it will target a DIFFERENT spot, he was assuming 1/6, easy error). 1/3*1/5=1/15 chance to "catch" a third freeze. Not a great chance, but it's there. Of course for a case with four birds it gets more complicated. Obviously the max number of crits frozen would be three, minimum 1. One would of course have a 1/225 chance. And seeing as the wall doesn't do anything it's being frozen obviously doesn't really matter, but still. Chances of three being frozen is 14/15 from the third bird multiplied by the chances from the fourth bird. The fourth bird having a 2/6 chance to miss the first hit and then (here's where things get a little fuzzy, is a frozen critter considered an empty spot? I don't think so, but I don't know for sure), assuming it misses it'll have a 2/5 chance to miss again. There's also the 1/6 chance that it hits the critter frozen by the first and doesn't get to try again. Which is a more complicated situation so... I'm going with a 26/30th chance to hit, but then multplying the 5/6 for the possibilty of hitting the frozen critter for a .72222 chance to freeze the third critter, which depends on the 2cnd critter being frozen so, it's a .72222*4/5ths overall chance for 3 critters to be frozen for a .57777777777 chance that 3 critters a frozen. .41777777777777 chance or so for 2 critters being frozen against a 5 critter wall rit when four birds are used.
I'm oddly bored. And I don't even know that bit with the last is correct as I've never taken a stats class and don't really know how to do that. Anywho, I'm also assuming that a bird targetting a critter already frozen doesn't target again.
So, do auras that target all the opponents (say the UPs if it actually worked, or the TS) What happens there? Only the critter in the same slot as the wall get the bonus? And it only hits once? That seems like it may be a bit overpowered.
Also, the wall seems a bit overpowered. It counters the freeze a bit in that, this wall isn't actually affected if it's frozen, and it takes two freezes off the field. Then, it'll take hits that would normally kill an entire ritual and give the others another turn to live. That's not necessarily a bad thing, but throwing two walls into a ritual would almost be necessary with tokens as they are. It'll take two hits, and pretty muchly make a bird rit entirely useless. Sure, it takes 4 slots, but gives you two slots you can almost be sure will get a chance to hit.
Of course their really aught be a better counter to rusties and birds. Eh, I like it, except for the taking all hostile auras.