Bontu's Monument

Black creature spells you cast cost {1} less to cast.
Whenever you cast a creature spell, each opponent loses 1 life and you gain 1 life.

Phyrexian Altar

Sacrifice a creature: Add one mana of any color.

This land enters tapped unless you control two or more other lands.
{T}: Add {W} or {B}.

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

Target opponent reveals their hand. You choose a nonland card from it and exile that card.

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Search your library for an artifact or enchantment card, reveal it, then shuffle and put that card on top.

{T}, Pay 1 life, Sacrifice this land: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.

Defender (This creature can't attack.)
Pay 1 life: This creature gets +1/+1 until end of turn.

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

({T}: Add {W} or {B}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

This creature enters tapped.
You may cast this card from your graveyard if you gained life this turn.

This land enters tapped unless you control two or fewer other lands.
{T}: Add {W} or {B}.