Chkot'Kruhl, Temporal Horror

Flying, ward {5}, deathtouch, menace, trample
When Chkot'Kruhl, Temporal Horror enters the battlefield, take an extra turn after this one.
{t}: Proliferate X times, where X is the number of legendary creatures you control, then create X 1/1 Tentacle Horror creature tokens.
{t}, Sacrifice all land and legendary creatures you control: All Horror creatures you control gain "Whenever this creature deals damage to a player,
that player loses the game."