The advantages of Skyclave are that it can answer non-creatures, even if it dies, they dont get the permanent itself back, and it costs three mana
The fact its Pierce the Pain attack doesn't use grass energy means you can even run it in any deck (though can doesn't mean should)
Last, and not least, we have cards with fixed rarities
The only reason Tachyon Transmigration isn't at the top of the list is that the Galaxy-Eyes Archetype isn't very good, which is why the card has never been an issue for the metagame
Creature - Cleric Dwarf Ironwill Forger Lieutenant At the beginning of combat on your turn, if you control your commander, target nonlegendary creature you control gains myriad until end of turn
The only thing going against Bugenhagen is the fact he isnt an Elf, I guess