The deck was so powerful that its reign is often called "Black Summer" or "The Summer of Necro." Several cards from the deck were later banned, but Necropotence appeared again later in several other decks, and was finally banned itself
I wouldnt get excited by a 4-mana draw-three normally, but you dont need to worry about casting the cards until next turn, and getting a burst of free cards gives you enough of an advantage to push a close game in your favor
Grotle Pokemon Temporal Forces Illustration Rare Holo #164 CGC 10
That's playing ball with some of the rarest Pokmon and Magic: The Gathering cards
Interestingly, PSA 10 versions of the Charizard also lost some value going from $400 down to $380
Rashmi and Ragavan's ability resolves before the spell that caused it to trigger, but not before you have to pay for the original spell