I want to know the answer to the following question:
Mantras taught in the Saiva, Garuda, and Vaisnava tantra will be effective if applied by who?
All the background I'm provided with is that "The Mañjusrimulakalpa, which later came to classified under Kriyatantra, states that mantras taught in the Saiva, Garuda and Vaisnava tantras will be effective if applied by Buddhists since they were all taught originally by Manjushri.". Is that enough to answer the question?
Answer: yes