It requires 1 tribute
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it is not very rare, but I heard it is sold for 2 bucks
You can, only if something specifically says you can. Tribute for most Ritual Spell Cards can come from hand. But if the card doesn't specify, the tribute must come from your side of the field.
spirit cards and reshef of darkness
Yes, you can attack with the Tribute Summoned monster unless a card effect tells it not to or it is after the Battle Phase.
The best card in yugioh is the judegement dragon card.