Fulgurant Egg

Indestructible
When Fulgurant Egg enters the battlefield, put
a -1/-1 counter on target creature
{t} Sacrifice Fulgurant Egg; if there are 6 or
more -1/-1 counters on the battlefield you may
put a card named Grisag, the Fulgurant, from
exile onto the battlefield under your control.
Partner with Grisag, the Fulgurant