As a 4/4 flyer with infect, it can stack up poison on a single opponent fast, especially combined with his cheap haste-granting ability, particularly useful when Skithiryx is rising from the command zone multiple times a game
Some players use it more aggressively than I do, countering the first strong one mana card they see like Sol Ring, Mystic Remora, or a topdeck tutor like Vampiric Tutor or Mystical Tutor
Essentially, theyre Saga monsters that can fight like regular creatures, but still activate powers when lore counters are added, and vanish from the field once their final ability is used
Buying singles can be a cheap way to expand your collection, but properly rare Magic: The Gathering cards are a different story, with MTG prices ranging from a few thousand to three million dollars