Kel, Demon Lord

Deathtouch
Other creatures you control get +4/+4 and gain deathtouch
Whenever a player casts a spell, put a +1/+1 counter on Kel, Demon Lord
At the beginning of each upkeep, each opponent sacrifices a creature
{x}: Destroy X creatures
{b}: Put target creature from any graveyard into your hand
{t}: Target opponent loses X life, where X is the power of Kel, Demon Lord