I'm glad this card's ability made it into Oath
of the Gatewatch. There was a time when cards of
this style - quirky and complicated but with a
spectacular payoff - felt more common. They sort
of fell by the wayside for a while, but I think
it's good that they exist: not all of them
appealed to me, but it's important to remind
people once in a while that they can make a
crazy deck or two and that doing so can be fun.
I'm not sure how often you'll be able to set up
the trigger reliably in smaller formats, and in
any event there are few things in those sorts of
formats that you really benefit from having
eight copies of per se. But if nothing else, you
have an 8/8 Eldrazi and all the benefits that
brings, and it's an interesting enough variant
on Mass Polymorph to warrant some consideration.
The fact that it's colorless also makes it an
interesting option to try in various Commander
decks - red and green decks in those formats
have historically had little access to this kind
of effect.
Uhh.... huh. Well it's an 8/8 for 7, it kinda
scrys when it attacks, but only at the risk of
preparing the opponent for your next move. the
changing other stuff into other stuff is too
situational, but it's a may so I guess it's
okay? It won't set the world on fire, but it's
not inherently terrible.