When magic tools come in. The Tarot is one of those tools.
If you have a deck that you use for readings I recommend buying a second deck that you use just for magic only.
Some ways to use a Tarot Card in a spell:
Choose a card/s that represents your intention.
Carry the card with you.
Place it in your altar with gemstones and candles.
Use the card as a meditation focal point.
Place the card on the body.
Use it for dream work under your pillow before you go to sleep.