for example, you have more than 5 constant regeneration gems
play the first 5 that show up, if you want a bit faster regeneration rate, when you draw the 6th one you can replace a gem with it.
if you replace a gem, do so right after it casts, and you dont have to wait for it to cool down before you play the new gem
effect of this-- you can cast a 6th gem every 8 seconds
this is especially effective with gems that have high delays
..hope you followed that
I dont know if this would be considered good strategy, or an exploitation