Tinudîr, Corrosion Specialist

Flanking
When Tinudir, Corrosion Specialist enters the battlefield, Target creature gains Cumulative upkeep {1}.
When Tinudir, Corrosion Specialist dies, Put Tinudir, Corrosion Specialist into its owner's library just beneath the top three cards of that library.
"Field testing, I should have a thorough understanding of corrosion principles."