Here’s a good rule of thumb. Sum up points for chests like this:
- Glory chest: 1 point
- Gem chest: 10 points
- VIP chest: 100 points
- Guild chest (max level, Guardians still in): 5 points
- Guild chest (max level, Guardians out): 10 points
Pulling a mythic troop takes roughly 10000 points on average.