Shady Informant

The creature spell is a 2/2 creature spell with ward 2 generic mana that has no name, mana cost, or creature types. The resulting creature is a 2/2 creature with ward 2 generic mana that has no name, mana cost, or creature types. Both the spell and the resulting creature are colorless and have a mana value of 0. Other effects that apply to the spell or creature can still grant it any characteristics it doesn't have or change the characteristics it does have.

Any time you have priority, you may turn the face-down creature face up by revealing what its disguise cost is and paying that cost. This is a special action. It doesn't use the stack and can't be responded to. Only a face-down permanent can be turned face up this way; a face-down spell cannot.

A disguise ability lets you cast a card face down by paying 3 generic mana and announcing that you are using a disguise ability. Any time you have priority, you can turn a face-down permanent with disguise face up by paying its disguise cost.