Mutavault Bug
Mutavault cannot tap for mana when turned into a creature. It says it is still a land so it should work.
In order to reproduce this error, have 3 lands into play, being Mutavault one of them. After opponent attacks, activate mutavault ability to turn into a creature. Block with Mutavault. With untapped land and Mutavault, try to pay 2 mana to cast an instant.
No option to tap Mutavault for mana...
I have been playing Explorer Ranked on a Windows machine and this bug have been making me loosing games....
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[Deleted User] commented
The animation for summoning sickness is clear in your image. If you haven’t controlled a permanent since the beginning of your most recent turn, it will be affected by summoning sickness. Creatures won’t be able to activate abilities with the tap symbol in them.
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yourMum#81979 commented
Mutavault cannot tap for mana after turned into a creature. This happened to me twice. The first time it was after combat and the creature land was dealt 1 damage and now it was targeted by fatal push. Both times I was playing explorer on windows 10 PC. I hope the bug gets fixed ASAP, because it will lose people a lot of games.
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[Deleted User] commented
A creature is summoning sick if you have not controlled the permanent continuously since the beginning of your most recent turn. This goes for any non-creature permanent that is turned into a creature as well. Other types on the permanent don't negate summoning sickness.
And Arena even shows you that summoniong sickness applies to the Mutavault.