If a creature is attacking a planeswalker, that planeswalker's controller is the defending player. If a creature is attacking a battle, that battle's protector is the defending player.
14-07-2017
wotc
If multiple creatures block a creature with afflict, afflict triggers only once.
14-07-2017
wotc
Afflict causes the defending player to lose life; it's not damage or combat damage.
14-07-2017
wotc
Afflict resolves before combat damage is dealt. If this loss of life brings a player to 0 life or less, that player loses the game immediately. A blocking creature with lifelink won't deal combat damage in time to save that player.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.