The prevention effect prevents 1 damage from each source an opponent controls each time that source would deal damage to you. It prevents damage of any kind, not just combat damage.
2010-06-15
wotc
The prevention effect doesn’t affect damage dealt to a planeswalker you control (such as combat damage).
2010-06-15
wotc
The last ability won’t trigger at all unless, as an end step starts, you have already been dealt 5 or more damage that turn. It doesn’t matter whether any of it was combat damage or not, nor does it matter who controlled the sources of that damage. (In other words, it will count damage dealt to you by sources you control.)
2010-06-15
wotc
The effects from more than one of these schemes are cumulative.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Not Legal
Pauper
Not Legal
Vintage
Not Legal
Penny
Not Legal
Commander
Not Legal
Oathbreaker
Not Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Not Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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