Mystery Booster 2

Basic Snow Land — Mountain

Snow-Covered Mountain

Enchantment

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.

Counterbalance

Ravnica Remastered

Creature — Skeleton

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.)

Dimir House Guard

Duel Decks: Phyrexia vs. the Coalition

Artifact

{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.

Phyrexian Totem

Tenth Edition

Artifact Creature — Insect

{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.)

Mantis Engine

Time Spiral

Instant

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.)

Trickbind

Ravnica: City of Guilds

Creature — Zombie Wolf

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

Carrion Howler

Judge Gift Cards 2004

Creature — Phyrexian Horror

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

Phyrexian Negator

Eighth Edition

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

Solidarity

World Championship Decks 1999

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