Envy is a miniboss in The Binding of Isaac: Rebirth (TBOIR)
Envy is one of the Seven Deadly Sins
Envy will fly diagonally around the room
It bounces diagonally when it hits a wall.
Envy splits into 2 heads when you first kill it.
Then it splits into two smaller heads
which in turn split into two tiny heads each when killed
When Envy dies, a Troll Bomb is spawned.