Metapotence
Whether or not the effects are random is irrelevant, as the power to do anything includes the ability to achieve outcomes without directly using the power. This means that you can enact the effect of using the power without being subject to the limitations of randomness by removing the cause from an action while retaining the subsequent effect. For example, using the power might result in a random effect, but not using the power results in no random effect. By paradoxically using the power without actually using it, you're in a state of having not used it, and thus, the effect is not random.
Alternatively, you could have your future self come back in time and remove the limitation for you.