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This effect was supposed to be once per turn, but players could simply summon other Red-Eyes Darkness Metal Dragons to use the effect again

However, Arabian Nights cards are very popular, as well as cards illustrated by Dan Fraizer

Mox Sapphire doesn't do anything more than provide a single blue mana, but the fact you could play as many of these artifacts as you wished on the first turn meant it was theoretically possible to have far more mana than your opponent if you received a lucky draw

When you sacrifice one or more artifacts this way, tap up to X target creatures and you draw X cards

You do not want to play more than 2 of this card unless you plan to go beyond 40 cards