What I can say about Magics first legendary wall is that I think it will create fun game states for playgroups that are already enjoying formats like Star or Emperor, but dont have the game size to support it on a given night
Phenax Is Critical Without Phenax: - Your high-toughness creatures just sit there
Four sacrifices for your engine, one that will trigger Bane
(Until your next turn, that creature can't attack or block and its activated abilities can't be activated.) If a card has no mana cost, its escape cost is an unpayable cost, so you can't cast it for that cost
Here are the percentages: Five commons, one uncommons will happen 35% of the time
And of course Mirkwood Bats is the nastiest of all, bleeding each opponent on both your token creation AND sacrifice