Alexi, Zephyr Mage (Masques/Nemesis/Prophecy) Here's the difference between Odyssey Block and Masques Block: There weren't a lot of spells that could kill a three toughness creature in Masques Block, where there are quite a few in Odyssey Block
Grand Coliseum Five-color decks and commanders that care about you taking damage will love Grand Coliseum, and its easy to see why
His direct and pure damage based utility makes him appealing in most places and his low mana costs further increase his desirability
The second clause I think is the better one because as long as this is tapped, no one can swing at you with an army
Since poison is his thing, we wanted some sort of life-loss-matters ability
Most multiplayer players are running mass removal in their colors, so if you exile Damnation, Wrath of God, Austere Command and Blasphemous Act you get one for sure