Prevents Power Creep Issues: Over time, new cards tend to be more powerful than older ones (power creep)
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It That Betrays It That Betrays is a 12-mana Tergrid, God of Fright and a good sacrifice payoff, especially in decks that can cheat it into play
I can only guess that its down to the card being completely symmetrical, since most decks seem to want to use the graveyard in some way
Having four colors is a huge advantage over the normal Hydra color identity of mono-green, as it opens the doors to great pieces of support such as Brokers' Ascendancy and Corpsejack Menace
Overall, in a slower format, Powerglass finally has its chance to shine, and it is useful in a wide variety of decks