If your creature does end up in a fight where its behind on stats, you can activate any discard, loot or dredge effects even sacrifice other creatures to power up the Wreath and win the exchange
Throw in some mana rocks and a few more snakes, and your opponents will have a lot to worry about
Its definitely better than Sorins Thirst as its both more castable and can finish off Planeswalkers (and is particularly nice against Vraska, Swarms Eminence)
While there are not many such cards there are a surprisingly large number of good and great ones, both in green and in other colours
Its also really easy to break, as all you need is two creatures that can flicker each other, which not only produces infinite +1/+1 counters on your creatures, but also scales firebending up to make infinite mana when Zuko attacks
and they work with a variety of niche cards like Wrenn and Six and Baloth Prime