Afflict 2 (Whenever this creature becomes blocked, defending player loses 2 life.)
{2}{B}, Discard a card: Merciless Eternal gets +2/+2 until end of turn.
Afflict causes the defending player to lose life; it’s not damage or combat damage.
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.
If a creature is attacking a planeswalker, that planeswalker’s controller is the defending player.
If multiple creatures block a creature with afflict, afflict triggers only once.