Crystal Basilisk

First Strike, Trample
Whenever Crystal Basilisk kills a creature through combat damage, it becomes Incubated. During each of your upkeep steps, add an Incubate counter to it. When it reaches 3 Incubate counters, exile it, and create a token
copy of Crystal Basilisk.
"...It is a very solitary creature, Uni, probably the only one within a hundred miles... it's terribly dangerous! We HAVE to find it before it finds... EEE!"