As the name suggests, Mega Evolution's main focus is Mega Evolutions of popular and powerful Pokmon, and very few are more popular than Gen 1's starter Pokmon
Coffin Puppets - The Gruesome Monsters The creator of Coffin Puppets likely only gave it such gruesome artwork because they knew no one would actually use the card in their deck
A simple Ashiok trigger can make it very uncomfortable for stripped back highly refined goblin decks to have all the things they need to win
Commander players will clock that one straight away, and immediately Folk Hero and Guild Artisan will jump out at you
This means it can chip in for some early damage if it needs to, and it also means that in the extreme late game it will be absolutely massive, and difficult to take down Even without dragons, this offers some pretty nice fixing
For example, if you haven't drawn any cards yet during a turn and cast a spell that instructs you to draw three cards, you'll draw them one at a time