Carnival

{2}, {t}: Tap target creature.
The creature remains tapped for as long as
Carnival remains tapped.
You may choose not to untap Carnival during
your upkeep. If you don't, pay Cumulative
Upkeep {1} or untap this artifact. (At the
beginning of your upkeep, if this permanent is on the battlefield, put an age counter on it. Then you may
pay {1} for each age counter on it. If you don't, untap
this artifact and remove all age counters.)