Simplify the following text for a Grade 5 native English-speaking person.
Original: A complete set of cards is called a pack or deck , and the subset of cards held at one time by a player during a game is commonly called a hand . A deck of cards may be used for playing a great variety of card games , some of which may also incorporate gambling .
Simplified: The tarot deck with 78 cards is also a deck of playing cards .