In all honesty, I don't count cards that selects/draws cards from your deck to your card count...
This is because using these cards reduce the amount of cards within your deck, like Sangan, Morphing Jar, Evil Hero Infernal Prodigy, Reinforcement in the Army, and E-Emergency Call. Because Prisma also removes a card from your deck by its effect, I don't see a reason to take another card out of your deck.