Gibbering Descent

At the beginning of each player's upkeep, that player loses 1 life and discards a card.
Hellbent — Skip your upkeep step if you have no cards in hand.
Madness {2}{B}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Sanguine Bond

Whenever you gain life, target opponent loses that much life.

Spellshock

Whenever a player casts a spell, Spellshock deals 2 damage to that player.

Swamp

Mountain

Aether Sting

Whenever an opponent casts a creature spell, Aether Sting deals 1 damage to that player.