Xolon, the Egg Hatcher

At the beginning of your end step, you may sacrifice an Egg. Otherwise create a 0/1 green
Egg creature token with defender.

Whenever an Egg or Xolon, the Egg Hatcher
you control dies, you may pay {r/g}{r/g} . If you
do, create a 3/3 green Dinosaur creature token with trample.