Overwhelming splendor not disabling ability of Harbinger of the seas
Just had a game where I had Overwhelming Splendor on the table.
Opponent casts Harbinger of the Sea.
The Overwhelming Splendor should've cancelled all abilities of the Harbinger.
But yet - all my nonbasic lands turned into Islands.
It is still being turned into a 1/1 creature, but the the ability isn't suppressed.
I can find one other report of the Harbinger ability not being disabled - Almost a year old - this time by being enchanted with "unable to scream".
So the problem seems to be with the Harbinger ability overriding disabling effects.
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Rezzahan#77802
commented
And that is not an issue that needs fixing, because that is not a bug. Harbinger changes types, and so applies in layer 4. It loses its abilities in layer 6, way after its ability has been applied. Ability losing simply does not work against type changing effects (layer 4), or color changing effects (layer 5), because of the rules of the game.
The rules even explicitly state (613.6), that once an effect starts applying, it gets to apply fully, even if parts of its effect come in later layers after the ability creating the effect is lost. Examples are Ygra, Kudo, Kaito, Ashaya, etc. There is a looooong list of such cards .