K'rrik, Son of Yawgmoth

{4}{B/P}{B/P}{B/P}Legendary Creature — Phyrexian Horror Minion2/2

({B/P} can be paid with either {B} or 2 life.)

Lifelink

For each {B} in a cost, you may pay 2 life rather than pay that mana.

Whenever you cast a black spell, put a +1/+1 counter on K'rrik.

Lifelink. Damage dealt by this also causes its controller to gain that much life. · CR 702.15

K'rrik's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered. (2019-08-23)
K'rrik's ability doesn't modify or reduce costs you pay. It changes only how you may pay those costs. (2019-08-23)
You can't pay 2 life to pay for generic mana in costs you pay, even if an effect says that you must spend black mana to pay that generic mana. (2019-08-23)
If a cost contains a mana symbol that may be paid in multiple ways, such as {B/R}, {B/P}, or {2/B}, you choose how you'll pay it before you do so. If you choose to pay {B} this way, K'rrik's ability allows you to pay life rather than pay that mana. (2019-08-23)
A Phyrexian mana symbol contributes 1 toward the mana value of a card, even if life is paid for it. Specifically, K'rrik's mana value is always 7. (2024-06-07)
K'rrik's ability lets you pay 2 life for {B} in any cost you pay, including the mana costs of spells, activation costs, and even costs for special actions (such as morph). Any time you pay mana, that's a cost. (2024-06-07)