Sole Performer

Spending {T} allows you to activate the tap ability of a creature that's already tapped. Normally, you couldn't pay the cost of tapping the creature because it's already tapped. With Sole Performer, you don't have to worry about that. You have {T}!

You can't spend {T} to have a creature attack without tapping. You also can't use it to pay the cost of an ability that taps a creature without using the {T} symbol. For example, you can't activate an ability that says "Tap an untapped creature you control: [Do something]" with {T}.

For example, say you control Prize Wall, which has "{U}, {T}: You get {TK}." You activate Sole Performer to get {T}{T}. You then activate Prize Wall, spending {U} and one of the {T}s you got from Sole Performer. You could then activate Prize Wall again, spending another {U} and the other {T}. Prize Wall itself is still untapped at this point. You can then activate Prize Wall a third time, spending a third {U} and finally actually tapping Prize Wall.