Except the Simic are very well-known for splicing together multiple organisms. The more reasonable assumption is that the hooded figure is a humanoid creature (Human or Elf, probably) with tentacles grafted onto it in place of hands/arms, as opposed to the resurrection of an old and unpopular creature type. The first option fits all known information about the Simic and makes no further assumptions, while the latter assumes that the Cephalid type is being brought back into current usage, something that we have no evidence of being true.
The RTR Keyrunes animate into a Bird, Elemental, Devil, Insect, and Wolf. Octopus (or simply Mutant) fits into that lineup far better than Cephalid.
It's wishful thinking to see something with tentacles and immediately think "Cephalid" as opposed to "Octopus."
Except the Simic are very well-known for splicing together multiple organisms. The more reasonable assumption is that the hooded figure is a humanoid creature (Human or Elf, probably) with tentacles grafted onto it in place of hands/arms."
They were known to splice, but the taste of them now sounds more like a biology-oriented, nature guys than the previous mad science for the sake of mad sciencing. Unless it is all a cover-up, and they keep splicing away, just hidden from sight in one of those zonots. But somehow I don't see Zegana being OK with that...
They're still splicing. From the Planeswalker Guide:
Krasis. Any Simic hybridized lifeform is called a krasis, the catch-all term for such creatures. The new Simic Combine is careful not to repeat the mistakes of Vig and his bioengineers, but the guild still uses magic to coax new morphologies from existing creatures, as well as to combine traits from multiple organisms in one. Some of these are unique creatures that can't reproduce. A few multiply and become part of the guild's fabric.
Also, the keyrune is likely some form of this:
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She wants a ride on the pony, dude.
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