Just like persist on Putrid Goblin, undying is easier to break than a porcelain vase in a Matrix movie
Heres part of what I wrote about him: Xenagos will be the flagship of a tier 2 deck that occasionally flashes tier 1 success
Lorwyn Eclipsed's Kithkin This Kithkin would crack jokes with you over a pint, and I just love the stuff it's accumulated
Myrfors also hates the card and thinks its dumb that his terrible art was used, so hes in on the joke
That makes playing aggressively against your rival players far less costly, but can also be used tactically to deliberately take characters off the table to reactivate their effects as they enter or leave play - as with Merlin, Goat above
There are a ton of cards that care about enchantments in both green and white, and cards like Yavimaya Enchantress and Ancestral Mask help to promote building a huge creature that would love to have lifelink and trample