Blood Artist

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

Ramunap Excavator

Crucible of Worlds

Dictate of Erebos

Flash
Whenever a creature you control dies, each opponent sacrifices a creature of their choice.

Thalia and The Gitrog Monster

First strike, deathtouch
You may play an additional land on each of your turns.
Creatures and nonbasic lands your opponents control enter tapped.
Whenever Thalia and The Gitrog Monster attacks, sacrifice a creature or land, then draw a card.

Arcane Signet

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