Brood Gryphon

Offspring {2}
[Create a 1/1 token that is a copy of this creature if you pay the additional offspring cost.]

Flying
Hexproof

When this creature becomes tapped, "create one artifact egg token with two time counters, during your upkeep, remove one time counter. When there are no time counters left, sacrifice this artifact, create a 1/1 Gryphon with Flying."