Lord of Extinction

Lord of Extinction's power and toughness are each equal to the number of cards in all graveyards.

Dictate of Erebos

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

Parallel Lives

If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.

Blood Artist

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

Beastmaster Ascension

Whenever a creature you control attacks, you may put a quest counter on Beastmaster Ascension.
As long as Beastmaster Ascension has seven or more quest counters on it, creatures you control get +5/+5.