Metamorphic Alteration not copying static abilities of chosen creature.
Creatures enchanted with Metamorphic Alteration display the static abilities of the copied card, but do not take effect. Specifically, I have experienced this with Unsettled Mariner's counter effect and Drogskol Captain's +1/+1 and Hexproof abilities. So, if I cast metamorphic alteration targeting selfless spirit choosing drogskol captain to copy, the selfless spirit displays the art and abilities of the drogskol captain, but the original drogskol captain does not have hexproof and is still a 2/2. A similar result happened for a copied unsettled mariner with only one mariner trigger occurring. These occurred in two different games, one was in solitaire while the other was a 1-on-1 game in modern.

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AiSu#41018 commented
1: fails to copy persistent/continuous abilities
2: fails to copy trigger abilities
3: only copies activated/mana abilities
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r10pez10#81846 commented
Can attest to a related bug happening - today, Metamorphic Alteration on an opponent's Drannith Magistrate (choosing to copy an Arbor Elf) did not remove the static ability from the Magistrate