Dread Summons
{X}{B}{B}
Sorcery
Each player mills X cards. For each creature card put into a graveyard this way, you create a tapped 2/2 black Zombie creature token. (To mill a card, a player puts the top card of their library into their graveyard.)
Shared Trauma
{B}
Sorcery
Join forces -- Starting with you, each player may pay any amount of mana. Each player mills X cards, where X is the total amount of mana paid this way.