Realmwalkers beyond the first do not work if they name a different creature type.
Only the first Realmwalker works. I have replicated this in a solitaire game.
1. Playing Elves, play Realmwalker naming Elf.
2. Play Elves off the top as expected.
3. Play a second Realmwalker naming Beast.
4. Can't cast Craterhoof Behemoth off the top.

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StevomatUWR#94081 commented
Still not working :(
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Hannie95#91718 commented
Bug is still not fixed. Modern elves has 3 bugs and counting
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Void#62402 commented
I just wanted to update on this bug. Now, when I play a second Realmwalker, the first one stops working.
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Kamahl75#00441 commented
This issue happens regardless of the creature type. Named Ooze and it did the same.
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Musagete#34910 commented
Still haven't done anything on this?! And on top of that now, warmaster has a bug with the triggers. One deck, 2 bugs. Please, do something about both.
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Tha5505#60755 commented
When I have more that one Realmwalker out targeting different creature types, it won't let me play the second creature type from the top of the deck. I see this was an issue back in January, as well......