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I guess they need to reword the text then so there is no confusion. Unless they think people understand that "next" means the very next end step that comes up. They could add the word "that comes up" to the end of that so there is no confusion at all maybe?
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When the end step is pretty obviously the one from the same turn they will say "at the beginning of the end step" eg. Ball LightningHowever, when it's not as obvious, they use "at the beginning of the next end step" eg. Rakdos GuildmageThey are functionally equivalent. The reason they use different wordings is because typically you'll play Ball Lightning and its usually going to enter the field before the end step whereas with Guildmage you could reasonably use it before or after the beginning of the end step.
That's not likely to be the next end step to come up. If you cast Thatcher Revolt, a sorcery, during your main phase when the stack is empty (ie. usual sorcery casting time), and there are no other shenanigans in play (ie. Sundial of the Infinite), then your end step is likely to be the next end step.
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