Drawing a card whenever you cast a spell with mana value 5 or greater is excellent with sweepers like pre-rotation Sunfall, where you can kill every creature and draw a card, with removal spells like Leyline Binding, or with the various Overlords that can enter the battlefield for cheap via impeding, like Overlord of the Hauntwoods
The graded section feels like an afterthought compared to the raw card experience, and the pricing isn't as competitive as Misprint or eBay for slabs
Trigger Averna's ability and place a land from the exiled cards onto the battlefield tapped
This locations ability, Underwater Acoustics, gives any character positioned there an additional two points of cost to sing songs
The lowest recorded sale price is still a whopping $890
Many such cards have a triggered ability that transforms the card (when it's on the battlefield.) One of the most typical such ability is " at the beginning of each upkeep, if no spells were cast last turn, transform (this card) ." Many players actually don't realize that this is a normal triggered ability that uses the stack, and therefore can be responded to