Arcane Signet

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

Kothophed, Soul Hoarder

Flying
Whenever a permanent owned by another player is put into a graveyard from the battlefield, you draw a card and you lose 1 life.

{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.

When Plaguecrafter enters the battlefield, each player sacrifices a creature or planeswalker. Each player who can't discards a card.

Whenever a creature card is put into an opponent's graveyard from anywhere, you gain 1 life.

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

Whenever one or more other creatures die, draw a card. This ability triggers only once each turn.

When Fleshbag Marauder enters the battlefield, each player sacrifices a creature.

You have no maximum hand size.
{T}: Add {C}.