Hypnos, God of Sleep

Indestructible, Deathtouch, Delve
{b}{g/u}: Tap target creature. It doesn't untap during its controllers next untap step. Put a sleep counter on that creature.
{1}{b}{g}{u}: Target player puts the top 7 cards of their library into their graveyard. Draw a card.
{3}{b}{g}{u}: Target player loses life equal to the number of sleep counters on their creatures.