Riot Control
Instant
You gain 1 life for each creature your opponents control. Prevent all damage that would be dealt to you this turn.
"Ravnicans need order. If they don't have it, we shall bring it to them." —Isperia
Slawomir Maniak
Dragon's Maze (DGM)
• #6Rulings
Riot Control doesn't prevent combat damage that would be dealt to planeswalkers you control. It also doesn't prevent damage that would be dealt to creatures you control.
(wotc • 2013-04-15)
Count the number of creatures your opponents control as Riot Control resolves to determine how much life you gain.
(wotc • 2013-04-15)
Rulings
Riot Control doesn't prevent combat damage that would be dealt to planeswalkers you control. It also doesn't prevent damage that would be dealt to creatures you control.
(wotc • 2013-04-15)
Count the number of creatures your opponents control as Riot Control resolves to determine how much life you gain.
(wotc • 2013-04-15)