Nekrakefalia, The Beheaded

Whenever a creature you control dies if it was
bigger than all creatures you opponents control
you may return 2 other creatures from your
graveyard to the battlefield. Each of those
creatures has half the power and toughness
rounded down of the creature that died.
"When Nekrakefalia lost its first head it vowed in
its awoken revenge, it would make many,
many more."