Negetive to you chaos popups for this:
flipping up a Sanctum of Serra with this chaos ability if you have a significantly higher health total then 20
Acadamy at Tolaria West will destroy your hand without compensation.
Bant/Minamo/Naya when you personally cant use the chaos effect
The Hippodrome if no one has a creature with 0 power
Tazeem if you dont have a Spellbook/Undercity Reaches' chaos effect when later in the game

another problem is this plane while doing well to keep a game moving, can destroy your chances of winning if you have no tutors and you draw the card you need earlier then you can play it