As with all high-end Magic cards, condition and authenticity matter a lot
As you achieve minor weekly quests, such as inflicting X amount of damage or casting X number of spells of a certain color, you earn in-game gold that can be spent on slowly acquiring more booster packs, which you can open to earn a handful of randomly-generated cards
In corner cases, the player might use that four mana to cast another permanent spell for Celebration purposes
Azlask, the Swelling Scourge $19.50 Annihilator is a mechanic that, while generally balanced in the past, many players flat-out hate
Orcish Bowmasters Exxaxl: Hullbreacher enthusiasts rejoice
Paying four life seems a bit high for a single card, but the Library allowed you to effectively see into your future by a full two turns