Fleshroller Beetle

Hatch {b}{g}
{1}{b}{g}: The owner of target card in a graveyard shuffles it into their library, then that player
draws a card
Threshold — {3}{b}{g}, sacrifice Fleshroller Beetle: shuffle your graveyard into your library, then
draw that many cards. Activate this ability only
if seven or more cards are in your graveyard