i know alot of my friends use the 4 elements, which ever one is available
earth - you can use citrine stones
water - sprinkle with salt water (but not best one to choose as it could damage cards)
fire - light a candle and near them maybe? (also be careful with this)
Air - smudge
just some examples at the top of my head
i also like to hold each card for a min and take in the picture and i feel by holding each one individually you "connect"