In general, the casino is a terrible way to get 5★ heroes, as the odds are 1/1000.
These rewards go up with the level of the player as follows:
Each resource can appear in one of three quantities which change on each refresh. From left to right the chance for a certain quantity to appear on refresh is 55%/45%/5%. So if you're going to do a lot of spins (e.g. for the Casino event) it pays of to do a couple of free refreshes before you get the biggest amount of the resource you need most.
You can refresh the slots on the casino once every 3 hours for free, after that 50 Gems are required.
24 hours after the last refresh there will be a forced refresh the next time you access the screen (done automaticaly in the background, reseting the countdown).
Available 5 star Heroes from spins:
For every spin you make on the casino wheel, you get 10x Luck Coins. you get 10 from 1 spin and 100 from the 8 spin version.
Luck Coins are a currency used in the casino store in the top right conner of the Common Casino (denoted by 2 coins on a purple background).
You can refresh the slots on the casino store once every 24 hours for free, after that 50 Luck Coins are required.
Available items and heroes from the casino store:
You can refresh the slots on the casino once every 3 hours for free, after that 100 Gems are required.
24 hours after the last spin there will be a forced spin the next time you access the screen (done automaticaly in the background, reseting the countdown)..
As of this writing, the spins in Super Casino does not count towards the normal Casino events.
Available 5 star Heroes: