Eerie Droning

When you cast Eerie Droning, create X 1/1 black Insect creature tokens with flying.

Whenever an opponent casts a spell, exile the top
two cards of that player's library face down. You
may look at those cards for as long as they remain exiled.

Sacrifice four creatures: You may cast a card exiled with Eerie Droning without paying its mana cost.