Concluding kindred month, today I look at octopi.
Introduction
Octopus first came to us in the 1997 Portal set. A fair number were released in 2001-02's Odyssey block. (Aside: they were then called Cephalids, a creature type that has since been folded into the octopus type). Overall, 43 have been printed to date.
Octopi are overwhelmingly mon-blue (35 cards), with a dash of multi-colored (6 cards), with the remaining two black and colorless, respectively.
Sample/Staple Cards
Octopi seem to focus on either tapping creatures or drawing/discarding cards, as shown by the below examples. There are only 8 legendary octopi (and thus eligible to be commanders); of those, Marvo or Queza would be the most powerful based on their abilities. But more viable still are the three legendary creatures that synergize with four creature types: Kraken, Leviathan, Octopus, and Serpent. Those add 100+ creatures to the card pool and enable better deck building.