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depends on what the cards are
King of Cards was created on 2007-04-30.
Anna: 60 Joe: 30
30
A deck of cards consists of 52 cards. Each card is available four times. That makes 13 diffent card types. Four different cards are worth 10 points: 10, Jack, Queen, King. That means that 4x4 Cards out of 52 are worth ten. That are about 30% (30/100). Two tens in a row have the expectation of 30%x30% which is about 9%.
Either 8 or 15 cards.
345
You can only tribute 3 monsters to summon Slifer but if you control 30 cards in your hand his ATK/DEF would be 1,000 x 30= 30,000.
P(7)= 1/30
you cannot buy 30 microsoft points, and there are no pre-paid cards or selections for $30.
A Pack of Cards - 1914 was released on: USA: 30 April 1914
It is around £20 ($30)