While playing Monster Master, at the start of a match you will be dealt five cards from your deck to your hand, and one more at the beginning of each turn. You will not be able to see what cards your opponent has in his hand. Monsters must be summoned before they can attack. You may only begin to summon one monster each turn. Monsters cannot attack while being summoned. However, they can still be targeted by enemy attacks, or have magic cards used on them.