Another way to tell a Spree spell apart from non-Spree cards is to take note of the small + (plus) sign in the upper right corner near the mana cost
I keep thinking this is the same card until I see that big patch of Nyx in the background (even though the figure, pose, and accouterments are different)
Better yet, you get to keep the mana it generates until the end of your turn rather than lose it at the end of combat
Windfall is so good that you can only play it in Vintage (where it's restricted) and Commander, and is one of the best wheel effects available to blue
Although the tokens enter attacking if The Last Ronin's Technique's sneak cost was paid, those tokens were never declared as attacking creatures
Mox Tantalite - $19.83 One of the most iconic Magic artists ever, Dan Frazier, is responsible for the art of over half of the cards on this list