I thought swamp was going to be the hardest, but it turned out to be plains, Tom Jenkot, Sr
It also nullifies your opponent's graveyard - pretty backbreaking for strategies like 'Dredge' that rely on the 'yard - and allows you to grab your opponent's best threat from the void and play it free of charge (Okay, at the cost of its own life, but it's a lowly two-drop, so who cares?) Paired with targeted discard cards like the popular Thoughtseize, Dauthi Voidwalker has the potential to be super scary
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Thats something that couldnt easily be done during the Sun & Moon era, but would be trivially easy today
Cards related to "Full Art/White Kyurem".
Even though Im not sure being a tapper is all that relevant in a game of Commander, you do get a Clue token when you do it, so its always going to be useful