The first, from winter 2015, includes costumes based on Mega Lucario, Mega Audino, Mega Slowbro (the puffy shell jacket on this design should earn bonus points)
Strategic Summary: The second variant features what is possible whenever you have consistent access to that initial copy of Gurifoh, which happens to be even more frequent with the BLZD support wave for the Red Dragon Archfiend strategy
It will not reduce waterbend costs that are additional costs for casting spells.
It made the cards all feel individual, knowing that they didn't all seemingly go by the strict guidelines of the games' pixel art and covers
Channel [Pay Life, Cast Anything] Channel is one of the most infamous green spells ever printed
It can attack over to kill planeswalkers, survive against a Cavalier, and just kills faster which is key