Dragon temple

Dragon temple costs one less to cast for each Dragon you control.
Whenever a dragon enters the battlefield flip five coins. When you get 5 heads create a 6/6 Dragon creature token. When you get 4 heads create a 4/4 dragon creature token. When you get 3 heads deal 3 damage to any target. When’s you get 2 heads you take 1 damage. When you get 1 head you take 3 damage. When you get 0 heads you take 5 damage.