Leshrac's Rite

Enchant creature
Enchanted creature has swampwalk. (It can't be blocked as long as defending player controls a Swamp.)

Lost Soul

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Mind Warp

Look at target player's hand and choose X cards from it. That player discards those cards.

Mischievous Poltergeist

Flying
Pay 1 life: Regenerate this creature.

Necrosavant

{3}{B}{B}, Sacrifice a creature: Return this card from your graveyard to the battlefield. Activate only during your upkeep.

Nightmare

Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you control.

Painful Memories

Look at target opponent's hand and choose a card from it. Put that card on top of that player's library.

Perish

Destroy all green creatures. They can't be regenerated.

Pestilence

At the beginning of the end step, if no creatures are on the battlefield, sacrifice this enchantment.
{B}: This enchantment deals 1 damage to each creature and each player.

D'Avenant Archer

{T}: This creature deals 1 damage to target attacking or blocking creature.

Python

Rag Man

{B}{B}{B}, {T}: Target opponent reveals their hand and discards a creature card at random. Activate only during your turn.

Raise Dead

Return target creature card from your graveyard to your hand.

Razortooth Rats

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Scathe Zombies

Sengir Autocrat

Serf

When this creature enters, create three 0/1 black Serf creature tokens.
When this creature leaves the battlefield, exile all Serf tokens.

Classic Sixth Edition