Ultimately, as mentioned, I wouldnt hold your breath for any future rule changes regarding Meld
It calls into question the distinction I made about moving counters versus removing them and adding new ones, since this black creature is functionally the same as Thief of Blood, for +1/+1 counters at least
However, with this, they cannot hide their beef or Eldrazi Titans behind a smaller sacrifice, their biggest power gets sacrificed
I was extremely focused on these cards' interaction with spells like EphemerateEphemerate, which lead me to misjudge some of them
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That is, you can activate the equip ability targeting the creature Killer Cosplay's already attached to, but that ability resolving won't do anything