Caves of Koilos

{T}: Add {C}.
{T}: Add {W} or {B}. This land deals 1 damage to you.

Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Creatures your opponents control enter tapped.
Whenever a creature an opponent controls enters, you gain 1 life.

{T}: Add one mana of any color in your commander's color identity.

Whenever another creature enters, you gain 1 life.

Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life.

{T}: Add {C}.
{T}: Add {W} or {B}. Activate only if you control a Swamp.

This land enters tapped unless you control a Plains or a Swamp.
{T}: Add {W} or {B}.

{T}: Add {C}.
{T}: Add {W} or {B}. This artifact deals 1 damage to you.

Whenever an opponent casts a noncreature spell, that player loses 2 life and you gain 2 life.

Whenever you gain life, put two +1/+1 counters on Karlov.
{W}{B}, Remove six +1/+1 counters from Karlov: Exile target creature.

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.