Spiny Shard Skulker

Synchronize Turtle (At the beginning of your
end step, if you control both this creature and another creature that is an Turtle, exile them, then return this creature to the battlefield transformed)
Whenever Spiny Skulker is dealt damage, it deals
1 damage to target creature an opponent controls.
"Effective defenses, but only a mild annoyance to our
foes..."
-Saundra Syn