Hedron Crab is great for example, because it is a seriously quick win con in the landfall deck but also helps enabling dredge strategies
Players jokingly call it Magic's first Planeswalker, since it's got three abilities and has such an outsized impact
Not to say that there haven't been differences
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the sheer amount of sweepers and other answers flying around prevent people from establishing board positions that eventually lead to a game-ending state, and each lap around the table gets longer and longer with every player added, not only because of sheer amount of turns taken but also because the board gets more and more complex
We know the first two sets of meld cards, and what they meld into: Urza, Lord Protector and The Mightstone and Weakstone combine into Urza, Planeswalker, showing the moment of Urzas spark igniting in the wake of the activation of the Golgothian Sylex