Hisoka's Guard is a common Creature — Human Wizard card from Champions of Kamigawa (CHK), collector number 68. Current market price: $0.13 (foil $0.35), TCGplayer market prices via Scryfall.
You may choose not to untap this creature during your untap step. {1}{U}, {T}: Target creature you control other than this creature has shroud for as long as this creature remains tapped. (It can't be the target of spells or abilities.)