This is an easy Morphling for me, it was the coolest creature I recall ever seeing when it came out. The art is fantastic on the card and it was the inspiration for so many other creatures.
I have to give a honorable mention to a close runner up in Deranged Hermit though. He is "the" token creator and always will be.
Some LGS did charge more for BFZ fat packs due to the 80 full-art lands they were also more difficult to find in stores like Target because those lands helped sell the fat packs.
The biggest problem with the card is red has no way to interact with chill besides trying to play more lands, it's similar to say Light of Day a card that basically just single handily destroyed any aggressive black deck since they had no way to interact with it.
Heart of Kiran might be close in power level though I would argue it goes in vastly different decks assuming both were legal, but Aethersphere costs 1 more mana and doesn't loot so its a step down despite its 2 extra toughness.
The card also benefited from being almost 100% immune to sorcery speed removal which is just ridiculous. So it's a ridiculously pushed card that has the benefit of dodging a lot of removal since nowadays they don't just make all removal instant speed.
I really don't think people will be struggling to make their 3 or maybe even 4 color deck work in draft due to a lack of fixing.
They also won't be printing any ridiculously pushed cards that they had to worry about for 2 years or so when it was in standard like Snapcaster Mage. I guess with the quicker rotation system they can justify some more pushed cards since they will rotate faster, but Snapcaster required them to analyze every cheap instant/sorcery for standard, and how it interacted with Snapcaster before print. Even before they completely nixed core sets we were not getting that many reprints for formats like Modern. If they really want to push reprints besides sets like Modern/Eternal Masters they can offer more reprints of noteworthy cards in side products like Commander, Conspiracy, and/or Duel Decks.
You don't have to be a lord to prove you are the legendary werewolf, especially for a tribe like werewolf that has more of a loner aspect to them in most media.
20 Emrakul, the Game Ends
Legendary Creature - Eldrazi
When you cast Emrakul target player loses the game.
Flying, Indestructible, Hexproof, Trample.
When Emrakul deals damage to a player that player loses the game.
When Emrakul is put into a graveyard from anywhere, its owner shuffles his or her graveyard into his or her library.
20/20
There ya go a really "fun" and interactive card to play with folks. So much fun and interactivity had from this version!!!!
This card will cost 8-9 mana on a regular basis unless you are ramping up a storm with things that don't hit the graveyard. At 8-9 mana it is cheaper than Mindslaver if you are casting Mindslaver and activating it the same turn.
This thing is MUCH harder to kill in modern, without a doubt.