7 cards where the text includes “attack” and the text includes “alone” and (the cards are colorless or the colors is B)

Invalid expression “c:l” was ignored. Unknown color “l”

Altar of the Goyf (Modern Horizons 2 #220)

Altar of the Goyf {5}

Tribal Artifact — Lhurgoyf

Whenever a creature you control attacks alone, it gets +X/+X until end of turn, where X is the number of card types among cards in all graveyards.

Lhurgoyf creatures you control have trample.

“What dies grows the [illegible]”
—Clawed-out statue inscription

Illustrated by Yeong-Hao Han

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Bilbo's Ring (The Lord of the Rings: Tales of Middle-earth #298)

Bilbo's Ring {3}

Legendary Artifact — Equipment

As long as it’s your turn, equipped creature has hexproof and can’t be blocked.

Whenever equipped creature attacks alone, you draw a card and you lose 1 life.

Equip Halfling {1} ({1}: Attach to target Halfling you control. Equip only as a sorcery.)

Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)

Illustrated by Randy Gallegos

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Bonded Construct (Magic Origins #223)

Bonded Construct {1}

Artifact Creature — Construct

Bonded Construct can’t attack alone.

Loyal to a fault, it heeds its master’s every command.

2/1

Illustrated by Craig J Spearing

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Grasping Shadows // Shadows' Lair (The Lost Caverns of Ixalan #108)
Grasping Shadows // Shadows' Lair (The Lost Caverns of Ixalan #108)

Grasping Shadows {3}{B}

Enchantment

Whenever a creature you control attacks alone, it gains deathtouch and lifelink until end of turn. Put a dread counter on Grasping Shadows. Then if there are three or more dread counters on it, transform it.

Shadows' Lair

Land — Cave

(Transforms from Grasping Shadows.)

{T}: Add {B}.

{B}, {T}, Remove a dread counter from Shadows’ Lair: You draw a card and you lose 1 life.

The shadows make no mark upon the flesh. It is the mind they claw and strangle.

Illustrated by Sam Wolfe Connelly

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Nefarox, Overlord of Grixis (Magic 2013 #103)

Nefarox, Overlord of Grixis {4}{B}{B}

Legendary Creature — Demon

Flying

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Whenever Nefarox, Overlord of Grixis attacks alone, defending player sacrifices a creature.

5/5

Illustrated by Aleksi Briclot

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Reaper's Talisman (Adventures in the Forgotten Realms #117)

Reaper's Talisman {B}

Artifact — Equipment

Whenever equipped creature attacks, it gains deathtouch until end of turn.

Whenever equipped creature attacks alone, defending player loses 2 life and you gain 2 life.

Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Illustrated by Olena Richards

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Sigil of Valor (Magic Origins #239)

Sigil of Valor {2}

Artifact — Equipment

Whenever equipped creature attacks alone, it gets +1/+1 until end of turn for each other creature you control.

Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

With each honor he earns, Gideon paves the path to his redemption.

Illustrated by Dan Murayama Scott

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny

Though this query has ended, its relics still slumber in New Argive.