They say a picture is worth a thousand words, so here’s a moving picture.
At around 52 seconds I play a Stomping Ground into Blood Moon.
Under the new rules (introduced with Ixilan), the Stomping Ground’s ETB replacement ability should not be checked. I should not have the option to pay life, and the land should ETB untapped as a non-basic Mountain.
MTGO is still working to the rules that existed prior to Ixilan, so the ETB replacement still occurs. Fortunately this didn’t cost me the game.
This is a known bug, but as Blood Moon is one of the highest profile cards in the Modern format, and the Blood Moon – Cavern of Souls interaction comes up in Legacy too, you should be aware of this one.
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