I'll put an end to this: Here's my list, not necessarily better than the previous loop, but certainly contenders.
Pack Rat - I know he was only good in Standard, but you can't deny that in any format, if you get him rolling, he takes over the game. Unlike all the other guys mentioned, Pack Rat is good by itself. After you drop him, all you need for a big fat herd is more cards.
Young Pyromancer - As Modern and even Legacy has been showing, Romancer of Pies is good in many formats. All you need is spells, which you were casting anyway. He adds value to what you were already doing.
Monastery Swiftspear - I can't leave her out; she's seeing play in Modern and Legacy too. Like Quiche Lover, she adds value to what you were doing already.
Platinum Angel - Hey, it has "you can't lose" printed right on it, what more could you ask for? Anything worth building a whole deck around to cheat out early has to be worth something.
Thrun, the Last Troll - For sheer resilience. There's something to be said for being flat out impossible to kill.
Arcanis the Omnipotent - In COMMANDER at least, he's just a bomb. A free Treasure Cruise every turn, free tap ability means he can be easily exploited or used in infinite combos.
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Just to make sure that people understand that cards on the banned list arent "op" by themself, they are usually just specific for a deck that abuses them to a level that becomes a problem for a format that cannot be solved in a reasonable way.
In general you will allways have very efficient cards, how that matters depends on the format.
Goyf isnt just good on its own, it becomes good, because other cards, like fetchlands and 1 mana spells are present and also very good to pair with it.
Just try a Goyf in an EDH deck that plays multiplayer and you see its quite meaningless, as it doesnt do anything that matters (same for limited, goyf suxx quite a lot in limited if you cant really grow it, so the format and your deck have to take advantage of it to make it matter, and thats not a given ; while its fairly trivial to make a modern/legacy deck that can just include goyf and allready has all the tools needed to make it great).
Just like goyf Deathrite Shaman works "naturally" with fetchlands and other efficient spells, on itself its decent, but hardly broken.
Cards that are truly broken are pretty much allways part of some combo and do something that either wins right on the spot or sets up a chain of events that will end the game ; cards like these include Goblin Welder, Goblin Recruiter, Goblin LackeyCranial Plating, Arcbound Ravager, Academy Rector, Stoneforge Mythic.
The deal with these cards is, they can either be completly useless, or they are sleepers, till a specific combo piece is printed that makes the card completly go over board (and thats also why they are so often just "good" cards, but become a problem later on).
Some cards produce a near endless amounts of card advantage and not dealing with them immediatly will result in dire consequences (Consecrated Sphinx, Griselbrand, Jin-Gitaxias, Core Augur, and the Eldrazi titans etc. etc.).
It takes a deck and a metagame for card to become good.
People don't put Tarmogoyf in all green decks Barbarian Horde can be worse than Centaur Courser in a match against Abrupt Decay
Chalice of the Void is restricted in vintage like power nine, but is ok in legacy
So cards can't be compared to each other directly objectively
Well they can be, but then subjective scale is required
I'll put an end to this: Here's my list, not necessarily better than the previous loop, but certainly contenders.
https://fieldmarshalshandbook.wordpress.com/
RUGLegacy Lands.dec
RUGBLegacy Lands.dec
RGLegacy Lands.dec
WUBRG EDH Lands.dec
UBR EDH Artificer Prodigy
B EDH Relentless Rats
In general you will allways have very efficient cards, how that matters depends on the format.
Goyf isnt just good on its own, it becomes good, because other cards, like fetchlands and 1 mana spells are present and also very good to pair with it.
Just try a Goyf in an EDH deck that plays multiplayer and you see its quite meaningless, as it doesnt do anything that matters (same for limited, goyf suxx quite a lot in limited if you cant really grow it, so the format and your deck have to take advantage of it to make it matter, and thats not a given ; while its fairly trivial to make a modern/legacy deck that can just include goyf and allready has all the tools needed to make it great).
Just like goyf Deathrite Shaman works "naturally" with fetchlands and other efficient spells, on itself its decent, but hardly broken.
Cards that are truly broken are pretty much allways part of some combo and do something that either wins right on the spot or sets up a chain of events that will end the game ; cards like these include Goblin Welder, Goblin Recruiter, Goblin Lackey Cranial Plating, Arcbound Ravager, Academy Rector, Stoneforge Mythic.
The deal with these cards is, they can either be completly useless, or they are sleepers, till a specific combo piece is printed that makes the card completly go over board (and thats also why they are so often just "good" cards, but become a problem later on).
Some cards produce a near endless amounts of card advantage and not dealing with them immediatly will result in dire consequences (Consecrated Sphinx, Griselbrand, Jin-Gitaxias, Core Augur, and the Eldrazi titans etc. etc.).
WUBRG#BlackLotusMatterWUBRG
👮👮👮 #BlueLivesMatter 👮👮👮
For pure breakability, cards like Myr Retriever and Metalworker are hard to argue with.
Then there are the little engines that never quite could, like Myr Superion and Skaab Ruinator.
Low-power cube enthusiast!
My 1570 card cube (no longer updated)
My 415 Peasant+ Artifact and Enchantment Cube
Ever-Expanding "Just throw it in" cube.
People don't put Tarmogoyf in all green decks
Barbarian Horde can be worse than Centaur Courser in a match against Abrupt Decay
Chalice of the Void is restricted in vintage like power nine, but is ok in legacy
So cards can't be compared to each other directly objectively
Well they can be, but then subjective scale is required
G Green Stompy
RG Shamans
UB Mill
UG Infect
WUBRG Slivers!