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This is a new section about mana. The most notable item is what's not here: mana burn. Each player's mana pool is now cleared at the end of each step and each phase (as opposed to just the end of each phase), but this no longer causes life loss. Additionally, each time a player passes priority or spends mana, if any mana remains in that player's mana pool, he or she must announce what mana is still there.
Important for all combo players out there.
In my experience, combo players were doing this anyway? But yeah making a rule of it is not a bad idea, I mean if someone's combo depends on recurring effects to generate tons of mana, we ought to all be able to say just how much mana is floating around out there.
EDIT: They went out of their way for Waylay and Co, again. I'm just saying it for the lulz now, I don't own any Waylays anymore, but
dammit. I can't tell the difference between functional errata, power level errata, restorative errata or anything else anymore, because most of it is subjective and depends much on what's in play, what's been played, etc etc etc - see their Coal Stoker example for weird ass, pointless interaction tripe. Which EOTs are 'supposed' to be EOTs? Differentiating between "beginning of end step" and "beginning of cleanup step" obviously just gives them a cleaner version of substance and allows for more intricacies in regard to EOT effects, but what does that have to do with only certain cards already in print? Blah. It's just sad, that's all.
EDIT2: So wait wait wait - Phasing causes permanents to "cease to exist, temporarily", but has nothing to do with being Exiled? Isn't it then, actually, temporarily removed from the game? after they got rid of RFG, they go and... whatever.