This will probably always be worth at least something, so its not the worst pull
Embercleave naturally benefits an aggressive playstyle and its ability to be played at instant speed, after blockers have been assigned, is one of its best features
Perhaps the pattern of making copies that differ from the original is enough to bar entry into paper Magic, but there's plenty of precedent for copy cards with altered characteristics
Prices rise as sealed boxes become harder to find
If the ability is countered or otherwise fails to resolve after being activated, it can't be activated again
Add +1/+1 Counters +1/+1 counters will be the bread and butter of this deck, boosting Mes size over the course of the game, so cards like Hardened Scales and Forgotten Ancient will do a lot of work