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Sarkhan was the first planeswalker with no plus loyalty abilities

It completely warped the meta and hasn't left, despite one of the fusions being banned.

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So exactly which cards in the Sword & ShieldDarkness Ablaze expansion should we keep an eye out for

There is effectively an in-built system for countering any destabilising effects from whales: the rarest cards are just even fancier-looking versions of the functionally identical, already-rare ones most non-spending people build their battling decks around