Biolume Egg // Biolume Serpent

Biolume Egg

Defender
When this creature enters, scry 2.
When you sacrifice this creature, return it to the battlefield transformed under its owner's control at the beginning of the next end step.

Serpents leave their eggs in the cold and inky depths...

Biolume Serpent

Sacrifice two Islands: This creature can't be blocked this turn.

...knowing their hatchlings are more fearsome than anything else that might come along.