Making your nonland permanents all colors lets you take advantage of color-based anthem effects like Sylvan Anthem and Deathbringer Liege
It is really a shame that this isn't a particularly flavourful card in terms of effect, with nothing in the art or flavour text having any connection to sacrificing a swamp to regenerate a creature
For now, this list only applies to the main competitive constructed format
Fastbond is a fantastically powerful card, but only if you put in the work to build around it, which does keep it in check and a little lower on this list
Long term players will be familiar with the mechanic of transforming from a human form on one side to a werewolf on the other, but the new global day-night cycle offers a significant twist, meaning that a card can enter play as a werewolf if its nighttime
On occasion I have considered sticking this spell on an Isochron Scepter, especially if I can fetch the Reunion off of a Cunning Wish