Riptide Gearhulk
From Aetherdrift set
Riptide Gearhulk
Artifact Creature — Construct
2/5
Double strike
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When this creature enters, for each opponent, put up to one target nonland permanent that player controls into its owner's library third from the top.