This is particularly useful in sacrifice decks that benefit from killing their own creatures
With a reasonably low Ink cost of 4 (and no option to use it in your Inkwell, as is the case with several cards on this list!), its easy enough to get Robin Hood into play
You can get flood counters from Xolatoyac and cards like Aquitect's Will and Eluge, the Shoreless Sea, though you have to go through quite a few hoops for those untapped lands
If you have this in play and cast Jodah, the Unifier or Niv-Mizzet Reborn, this basically doubles your mana for the turn
Fortunately, blue has access to a variety of X spells that happily scale to whatever mana you have available to sink
In Amethyst/Steel the one foil Jafar is key, then there are just 7 Illusion cards