Knights of the Frozen Throne is now live with 135 new Hearthstone cards. We taked Ville "OldGuardian" Kilkku to take a look at some of the more notable cards and break down the math behind them, their interactions, and potential synergies.
We have always been interested in the nittygritty details behind Hearthstone cards, but this information is difficult to find, and sometimes even more difficult to calculate yourself considering some details aren't available in the game itself. Therefore, we set out on a journey to find out just how the cards work.
Here are the card guides we've released today and an excerpt from Stitched Tracker.
As a threemana 2/2, Stitched Tracker is a significant tempo loss when played, unable to compete with other minions of similar mana cost. Hunter also has tons of threecost cards available, so competition for the deck slot is fierce.
Stitched Tracker Discovers a copy of a minion, and therefore generates additional resources as the original minion remains in the deck. The flexibility of the Discover effect also allows you to pick a minion that is good for your current matchup and situation.
Stitched Tracker can find specific minions in combo decks and decks with a small number of minions extremely reliably. For example, a Yogg’n’Load style Hunter deck could play multiple YoggSarons with Stitched Trackers.
If there are up to three minions in the deck, Stitched Tracker will always offer each of them. With four minions, the probability to be offered a specific minion is 75%, and with five minions it is 60%.
If we take a look at Discovering minions from a more minionbased deck, we arrive at the following table:
Number of minions left 
Two copies of 
One copy of 
Probability to find a specific minion with two copies left 
Probability to find a specific minion with one copy left 
14 
6 
2 
42% 
23% 
14 
4 
6 
41% 
23% 





12 
5 
2 
49% 
28% 
12 
3 
6 
47% 
26% 





10 
4 
2 
58% 
34% 
10 
2 
6 
55% 
32% 





8 
3 
2 
71% 
44% 
8 
1 
6 
64% 
39% 





6 
2 
2 
87% 
63% 
6 
1 
4 
80% 
55% 
As can be seen from the table, because Discover offers you three options, the probability to find a specific minion increases rapidly as the number of minions left in the deck decreases. The probability to find a minion you have two copies left is also a fair bit better than the probability to find a minion with just one copy left.
For a minionbased deck, in the midgame you can expect to Discover a minion with two copies left in the deck roughly half of the time. In the early game, the odds are somewhat lower than that. Picking up that single copy of N’Zoth is not very easy though.