Here you can draw level 2 to 5 star creatures with coupons (ingame currency).
Creatures can be drawn one at a time, or five at a time, each card costing 1 coupon. Each card drawn has a 1 in 100 (1%) chance of being a generic 5 star creature. Statistics shared on the forums prove that there is ABSOLUTELY NO difference between drawing 1 creature at a time, and drawing 5 creatures at a time. Both draws have an equal chance of providing the player with a 5 star creature. This has also been backed by IGG themselves, who have responded to multiple concerned players saying that using the x5 coupon draw is the same thing as doing the x1 coupon draw 5 times.
The player can acquire coupons by completing the Daily Tasks, for sharing their feats on Facebook when they acquire a 4 or 5 star creature (or when they acquire a 3, 4, or 5 star hero), etc.