It really depends on luck,right? 1/4 chance to win due to SoFre.
The 25% is additive, so 4 SoFr would grant you 100% chance.
It's definitely not additive.
The chance to hit critically certainly is. Try testing a deck with 4+ SoFr and Airborne creatures and see how many of them don't hit critically each turn when 4+ SoFr are active on your side of the field.
if the answer is that any, at all, don't get the crit dmg, every single turn, then they are not additive. I was assuming they just act independently, meaning the chance to crit is 1- (0.75^x) where x is how many SoFrees you have.
1 shard: 25% crit chance
2 shards: 43.75%
3: 57.8%
4: 68.4%
5: 76.3%
6: 82.2%
Can anyone definitively confirm or deny this?