John Zeleznik

Dimir House Guard

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Sacrifice a creature: Regenerate this creature.
Transmute {1}{B}{B} ({1}{B}{B}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Counterbalance

Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same mana value as the revealed card.

"It's a clever design. You should look closely at its gearing after it swallows your head."
—Jhoira, master artificer

Mantis Engine

{2}: This creature gains flying until end of turn. (It can't be blocked except by creatures with flying or reach.)
{2}: This creature gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Trickbind

Split second (As long as this spell is on the stack, players can't play spells or activated abilities that aren't mana abilities.)
Counter target activated or triggered ability. If a permanent's ability is countered this way, activated abilities of that permanent can't be played this turn. (Mana abilities can't be targeted.)

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Counter target activated or triggered ability. If a permanent's ability is countered this way, activated abilities of that permanent can't be activated this turn. (Mana abilities can't be targeted.)

Phyrexian Totem

{T}: Add {B} to your mana pool.
{2}{B}: Phyrexian Totem becomes a 5/5 black Horror artifact creature with trample until end of turn.
Whenever Phyrexian Totem is dealt damage, if it's a creature, sacrifice that many permanents.

{T}: Add {B}.
{2}{B}: This artifact becomes a 5/5 black Phyrexian Horror artifact creature with trample until end of turn.
Whenever this permanent is dealt damage, if it's a creature, sacrifice that many permanents.

Snow-Covered Mountain

They chase tirelessly after the bone-carts that speed along the streets of the Plague Quarter.

Carrion Howler

Pay 1 life: Carrion Howler gets +2/-1 until end of turn.

Pay 1 life: This creature gets +2/-1 until end of turn.

"We must all hang together, or assuredly we shall all hang separately."
—Benjamin Franklin

Solidarity

Creatures you control get +0/+5 until end of turn.

Phyrexian Negator

Trample
Whenever Phyrexian Negator is dealt damage, sacrifice a permanent for each 1 damage dealt to it.

Trample
Whenever this creature is dealt damage, sacrifice that many permanents.

"What we do not use up, we use again."
—Urza

Thran Foundry

o1, oc
T, Remove Thran Foundry from the game: Target player shuffles his or her graveyard into his or her library.

{1}, {T}, Exile this artifact: Target player shuffles their graveyard into their library.