Baleful Strix

Flying, deathtouch
When Baleful Strix enters, draw a card.

Sudden Edict

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Target player sacrifices a creature of their choice.

Smallpox

Each player loses 1 life, discards a card, sacrifices a creature of their choice, then sacrifices a land of their choice.

Underground River

{T}: Add {C}.
{T}: Add {U} or {B}. Underground River deals 1 damage to you.

Black Vise

As Black Vise enters, choose an opponent.
At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.

Winter Orb

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Howling Mine

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.