Me and my team sent 15 waves in a game of double income earlierA level 5 magma cube splits 5 times when it dies.
2x2x2x2x2 = 32 magma cubes
If you send a full wave : 32x12 = 384 magma cubes
If you send 10 waves : 384x10 = 3840 magma cubes
That is a lot of mobs...