Ironically, the expensive finisher is the draw for Commander, with the removal spell being the 'hidden' reward
MTG Cascade is a keyword that lets you cast an extra spell for free, but behind this simple concept, you'll find surprising complexity
When you throw in the immunity to Commander tax, the potential for library manipulation, the each opponent wording on the trigger, and the massive scaling when played with other Ninjas, you get the most fearsome tempo creature this side of Ragavan
Blue has plenty of cards like Aphetto Alchemist and Fatestitcher to untap this and draw multiple cards, and you can repurpose many of those cards into combo pieces that win the game
If you copy the spell, the first creature becomes the target of the copy causing the best in show ability of the second creature to trigger
I've always found Black and White cards to work well together