A spell while meditating? Hm, I suggest you try to call your spirit guides! If you say you are good at meditating, then calling your spirit guides would be a good place to start.
How to do this? While in deep meditation, start to listen to your inner mind and its workings. Then say within yourself, "I call you spirit guides, make yourself known", or something of that nature. It is that simple. It may or may not work, sometimes it takes multiple sessions. Just keep trying.
When the guides show themselves, they could take on the form of any animal, so keep an eye out for that. You can mistake guides for figments of your imagination, often.
Do try this, and let us know how it goes