devtrackers.gg
And that's how it looks like in an actual direct challenge:
Apparently that MTGA is smart, but is mistaken about some things. We can fill the nerdiest bug report ever
Lemme put it this way: we know. Just because rules-correct is NP-hard doesn't mean we should bend over backwards to solve it. We have some simpler heuristics that determine whether we allow you to submit your blockers given the block-requirements. #wotc_staff
I and /u/jfb1337 found a legit bug. It appears that Monstrous Step incorrectly works with extra combat phases. The specific requirements are wiped.
I think that non-specific requirements (Declare Dominance and Emergent Growth) work correctly, but yet unable to confirm it for sure.
EDIT: Declare Dominance appear to be working, but Emergent Growth is bugged
Thanks, it looks like a fairly straightforward bug with the "block" and "must" verbs. The rules changed in Ixalan and I guess we never noticed. #wotc_staff