This is just another layer of depth to the mechanic and isnt something youll do often unless you play a ninja-themed deck, but its good to know just in case
For example, Oranguru from Vivid Voltage and Rillaboom from Darkness Ablaze are fantastic cards, but they dont hold the same high price tags
Then if you trade with a two-toughness dork or pull a removal spell like Wing Snare or Terminate you'll be a three for one
Animate Dead must target a creature in your yard at that point, so it returns the Dragon, exiling all permanents and starting the whole process over again
Umori, the Collector Umori, the green/black companion, restricts the spells in your starting deck to cards of a single type
I would have preferred a lower casting cost and no damage bonus