(6/13/2017) If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs, such as emerge costs
You can even block to soak up damage and then before damage, sacrifice this to a Deadly Dispute or Reckoner's Bargain for extra value
Additionally, one-time use blue mana cards like High Tide wont be on this list, since ritual effects deserve their own list
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If a card or token would be put into your graveyard from anywhere, exile it instead
Super solid list all around here