Something is strange with the bosses. I opened all the cards and bought all the bonuses, except for the second Zeus bonus. And that's how the math turns out.
On average, I open 1e9 Cards. Taking into account the multiplier, 1e11. The chance to get a boss card = 0.07%, which means I will get 7e7 boss cards. The chance of getting an Epic card is 8e-10, so I will get only 0.056 Epic cards out of 7e7 cards. 1 out of 20. At first glance, the chances are good, but for the second day now I've been trying to get at least one and I haven't gotten anything. The opening requires me to play an active game for a minute and a half. Plus about 8 minutes of cooldown. Round it up to 10. It's clear that theoretically I can run a cycle every ten minutes, but in practice I do it much less often. Because it's boring as hell to repeat the same thing over and over again without any hope of success.
The undisclosed Zeus bonus will give me poke about 25 times more cards. But to get it, I need to continuously poke cards with an autoclicker for about 40 hours. And that's my best plan right now! :) I'll leave the game playing at night for about a week, and I'll get a chance to get one card per poke. In principle, the process can be accelerated if I collect even more cards of the Greek Gods. But to do this, I'll only have to open them about 20,000 times. Or 200 with a multiplier of x100. With a cooldown of 19 minutes. It won't be faster, the bosses still have a 1 chance in 20 showdowns, but here you need 200 to just cut the time to get the Zeus bonus in half.
If I study Skills carefully, then after about 12 hours of auto-click, I will get a slight decrease in cooldown, which will not solve my problem in any way, because the problem is not the cooldown between attempts, but the fact that I spend a minute and a half on each attempt. And after that, I quit the game. It doesn't matter how much time passes between, in fact, each attempt is a game launch.
It's a very strange decision with these Bosses. Or there's something I really don't understand.