Sand Squid

Islandwalk (This creature can't be blocked as long as defending player controls an Island.) You may choose not to untap this creature during your untap step. {T}: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oan5773sjpb1hi0k08kcy.