mtg sets with serialized cards What are in Magic: The Gathering? A Brief History of Serialized

"Whenever another nontoken creature you control dies, exile it

This new style will be used on a total of 10 cards in the set

Usually you wont need that, but you can also use it to draw cards, if you already have access to plenty of mana

The real strength of Skyswimmer Koi comes when its surrounded by consistent artifact producers like Sai, Master Thopterist or Treasure Map

Crucible of Worlds was a fan generated card, and is getting pricey, so I could easily see that here

Use A Jewelers' Loupe And Find The Red 'L' WotC prints its cards using commercial printing presses that use engraved metal plates, one for each color