If you are referring to a general catalyst for magical practice, I'd suggest looking into crystals. It is a common belief that crystals and gems vibrate with their own, natural energies. They are believed to be able to store it, channel it, and balance it. Unfortunately, they can do this with both positive and negative energy so it helps if you clean your crystals regularly.
You can use stones to increase the potency of spells or rituals. The crystals can be used to amplify the energy. I use charged, clear quartz whenever I feel I need a little extra boost of energy. It's an amazing energy amplifier for spells and ritual work and I use it for just about everything. I usually have mine on my altar or in my hand while I'm doing a spell. If you are doing a ritual, you can sit some of them up around your ritual area or your circle (if you use one.)
I've added a few links below that you might find useful.
References and Info Sources for Further Reading: