Like most Magic: The Gathering cards, the value of Fireball depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Collectors' Edition)
When you tap an untapped creature that a foe controlled, you can spend one mana to scry 2 and draw
Regal Caracal I often talk about my responsibilities as head designer (see above for an example), but that's not the only role I play
The mana value of a split card is the total cost of both sides, so this has a mana value of four
These types of cards reimagine characters in a totally new light, sometimes at odds with their original design or personality
Noxious Gearhulk and Patron of the Vein fulfill similar roles, and are much stronger cards, providing decent damage, evasion, and secondary effects