Aboshan, Cephalid Emperor is the first Legendary Creature in alphabetical order in all of Magic (as of June of 2014).
He is a Legendary Cephalid – a creature type exclusive to Odyssey block, where they temporally replaced Merfolk as the usual blue creatures of the set. There are only two legendary Cephalids – Aboshan and Llawan, Cephalid Empress. At 4UU for a 3/3, he isn’t particularly impressive.
Aboshan is a straight forward Cephalid ruler – he taps his subjects (other cephalids) to tap permanents, and you can pay UUU to tap all creatures without flying – which includes Cephalids, interestingly enough.
I don’t know if I can particularly recommend him as a Commander, but he does combo very well with Archetype of Imagination.
Archetype of Imagination causes all of your creature to gain flying, and all of your opponent’s creatures to lose flying. Therefore, only you are benefiting from Aboshan, and you’re completely unblockable regardless of their creatures being tapped or untapped (unless they have reach, of course).
Notable cards that work with Aboshan:
- Archetype of Imagination
- Borrowing 100,000 Arrows
- Tamiyo, the Moon Sage