Beluga 1

Vigilance, Flying, Triple Strike, Devoid
Beluga 1's power is equal to the total number of
cards you have milled this game
When Beluga 1 enters the battlefield, gain 4 cat tokens
{t}, Sac 2 cat tokens: Shuffle target graveyard into
hand.
{t}, Sac 3 cat tokens: Target player mills 15 cards.
{t}, Sac 4 cat tokens: Conjure a card named
Blackest Lotus.