Mind Rot

Swamp

When Doomed Dissenter dies, create a 2/2 black Zombie creature token.

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

When Tattered Mummy dies, each opponent loses 2 life.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

When Merciless Executioner enters, each player sacrifices a creature of their choice.

As an additional cost to cast this spell, sacrifice a creature.
Draw three cards.

When Filigree Familiar enters, you gain 2 life.
When Filigree Familiar dies, draw a card.

Flying
{B}: Fetid Imp gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)