Ender Dragon

{t}{x}{2}Place X 2/2 Enderman creatures onto the field.
If Ender Dragon were to die, place a Dragon Egg token onto the field with 3 counters. When an Enderman dies, remove a counter. When it reaches 0, place a copy of Ender Dragon onto the field with a +1+1 counter on it.
Many an Adventurer have tried. All have died.