Song of the Dryads and
Blood Moon interact in a weird way: I enchanted my opponents
Blood Moon with
Song of the Dryads. The result was: All non-basic lands were still mountains, and couldn't be tapped for mana any more.
I'm pretty sure the Song should just overwrite the
Blood Moon and all the lands should work normally.
Edit: And another bug with
Emrakul, the Promised EndFirst time i cast it. I got control over my opponents turn, and wanted to kill him by tapping his 2 Ancient Tombs and then playing a fetchland from his graveyard, he had 2x
Crucible of Worlds in play. I couldn't do either, tried multiple times. Tapping the tombs didnt work, when i tried to play the land i got the usual prompt with 2 Crucibles in play (so i didn't mix up the priority), but the land never entered the battlefield.
Edit 2: As it worked in a different game, i might still have mixed up the priority.
And while i'm at it, this bug is older (last version, encountered it a week ago), but i doubt it's fixed: I had a Gitrog Monster in play. During my upkeep with the sacrifice trigger on the stack my opponent bounced it with
Karakas. I let that resolve and then of course didn't sacrifice a land to the Gitrog. Then (i realized that a few turns later, but that must have triggered it) i had the Gitrog Monster in hand and in the graveyard (i only play one, couldn't be a different card). Trying to cast the one in hand didn't work.