Odds of a crit in Daggerheart:
12 possible matches out of 12*12 possible roll combinations
12/(12*12)=1/12 or about 8%
This means crits in DH are more likely than in DnD which has a 1/20 chance or 5%
Odds of something with 1/12 odds happening twice in a row:
1/12 * 1/12 = 1/144 or about 0.7%