Profane Memento

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

Mind Stone

{T}: Add {C}.
{1}, {T}, Sacrifice this artifact: Draw a card.

When this creature enters, each player sacrifices a creature or planeswalker of their choice. Each player who can't discards a card.

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

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

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

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.

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