The number of stars (or the level of a monster) can range from one star to twelve stars.
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Unless the monster specifically says otherwise, it takes two tributes for a monster of Lv7+
Monster cards do not have life points and there is no concept of 'damaging' a monster card except for battle. In battle a monster either dies or it does not, there is no accumulating damage such as in Magic the Gathering. A monster can fight off an infinite amount of monsters that are weaker than it, but is destroyed if it battles with one of equal or greater power.
You can find Yugioh cards in many stores Here are some stores that will have them- Wal-Mart TargetSams Club Possibly a trading card came store and Possibly a comic book store
There is no real hard limit - as long as you've got a spell card in hand, and a slot in the S/T zone for it to go, then you can activate it.
there is no limit