The conversion of a $15 Amazon card to Nigerian Naira depends on the current exchange rate. Exchange rates are constantly fluctuating due to various economic factors such as inflation, interest rates, and market sentiment.

To determine the exact amount, one would need to check a reliable financial source or a currency exchange platform. As of [specific date], the exchange rate might be such that the value could be approximately [X] Naira. However, this figure can change rapidly.
It's important to note that when making any currency conversions, especially for financial transactions like purchasing an Amazon card, it's advisable to use official and regulated channels. This helps ensure accuracy and security in the exchange process. Also, keep in mind that different exchange providers may offer slightly different rates, so it's worth comparing to get the best deal for converting your $15 Amazon card into Naira.