When you set this scheme in motion, until your next turn, whenever a player taps a land for mana, that player adds one mana of any type that land produced.

When Abyssal Gatekeeper dies, each player sacrifices a creature.

Whenever a creature dies, put a charge counter on Black Market.

At the beginning of your precombat main phase, add {B} for each charge counter on Black Market.

Noncreature spells you cast cost {2} less to cast.

Whenever you cast a noncreature spell, counter that spell unless you sacrifice a creature.

Flying

Whenever Butcher of Malakir or another creature you control dies, each opponent sacrifices a creature.

Flying

When Carrier Pigeons enters the battlefield, draw a card at the beginning of the next turn's upkeep.

When Carrier Thrall dies, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add {C}."

Devoid (This card has no color.)

When Catacomb Sifter enters the battlefield, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add {C}."

Whenever another creature you control dies, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Whenever a creature you control dies, you draw a card and you lose 1 life.

Whenever another creature dies, you may gain 1 life.

Flash

Whenever a creature you control dies, each opponent sacrifices a creature.

When Doomed Dissenter dies, create a 2/2 black Zombie creature token.

When Driver of the Dead dies, return target creature card with mana value 2 or less from your graveyard to the battlefield.

Protection from white

At the beginning of your end step, you lose 4 life.

Whenever a creature dies, you gain 2 life.

When Dutiful Attendant dies, return another target creature card from your graveyard to your hand.

Lifelink

Whenever another creature dies, put a +1/+1 counter on Elenda, the Dusk Rose.

When Elenda dies, create X 1/1 white Vampire creature tokens with lifelink, where X is Elenda's power.

Flying

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

Whenever another creature you control dies, put a +1/+1 counter on Gavony Unhallowed.

Ghave, Guru of Spores enters the battlefield with five +1/+1 counters on it.

{1}, Remove a +1/+1 counter from a creature you control: Create a 1/1 green Saproling creature token.

{1}, Sacrifice a creature: Put a +1/+1 counter on target creature.

Whenever a nontoken creature you control dies, create a 1/1 green Saproling creature token.

Whenever a creature you control dies, each other player sacrifices a creature.

Lifelink

Whenever another nontoken creature you control dies, exile Liliana, Heretical Healer, then return her to the battlefield transformed under her owner's control. If you do, create a 2/2 black Zombie creature token.

+2: Each player discards a card.

-X: Return target nonlegendary creature card with mana value X from your graveyard to the battlefield.

-8: You get an emblem with "Whenever a creature dies, return it to the battlefield under your control at the beginning of the next end step."

Whenever a creature an opponent controls dies, put a +1/+1 counter on Malakir Cullblade.

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Whenever a Human deals damage to you, destroy it.

Other non-Human creatures you control get +1/+1 and have undying. (When a creature with undying dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Flying, trample

Whenever an opponent searches their library, that player sacrifices a creature and loses 10 life.

Whenever another creature dies, put a +1/+1 counter on Ob Nixilis, Unshackled.

Flying

When Overseer of the Damned enters the battlefield, you may destroy target creature.

Whenever a nontoken creature an opponent controls dies, create a tapped 2/2 black Zombie creature token.

Whenever another creature you control dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Whenever a creature dies, you may put a quest counter on Quest for the Gravelord.

Remove three quest counters from Quest for the Gravelord and sacrifice it: Create a 5/5 black Zombie Giant creature token.

Whenever another creature dies, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

{B}: Reaper of the Wilds gains deathtouch until end of turn.

{1}{G}: Reaper of the Wilds gains hexproof until end of turn.

Whenever a creature an opponent controls dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

At the beginning of your upkeep, if you control ten or more Treasures, you win the game.

Flying

Whenever another creature dies, you may put a +1/+1 counter on Scavenger Drake.

Whenever a creature dies, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

{4}{B}: Each opponent loses 2 life and you gain 2 life. Activate only if there are four or more creature cards in your graveyard.

Whenever a Saproling you control dies, Slimefoot, the Stowaway deals 1 damage to each opponent and you gain 1 life.

{4}: Create a 1/1 green Saproling creature token.

Flying

Swarm of Bloodflies enters the battlefield with two +1/+1 counters on it.

Whenever another creature dies, put a +1/+1 counter on Swarm of Bloodflies.

Sacrifice three white creatures: Exile target creature.

Whenever another black creature you control dies, create a 1/1 white Spirit creature token with flying.

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

Whenever a creature an opponent controls dies, you may cast target instant card from your graveyard. If that spell would be put into a graveyard, exile it instead.

Whenever another Human creature dies, put a +1/+1 counter on Village Cannibals.

Haste

Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni, Undying Partisan.

Sacrifice another creature: Yahenni gains indestructible until end of turn.

Whenever Zulaport Cutthroat or another creature you control dies, each opponent loses 1 life and you gain 1 life.