Treasure Cruise is close to free once you get its cost down to a single blue
There are also paradox effects, or ones that care about casting spells from zones other than your hand
The Chinese version of the card had flesh painted onto the skeletons, in order to make them look like zombies
Your custom MTG cards arrive printed on premium card stock, sleeved in a free magnetic case, and shipped to your door in two to three business days

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It can only sacrifice once each turn, so it's not an outlet in the same way that Viscera Seer or Carrion Feeder is