5 cards where the text includes “creature has double strike” and (the cards are colorless or the colors is RW)

Bladehold War-Whip (Phyrexia: All Will Be One #197)

Bladehold War-Whip {1}{R}{W}

Artifact — Equipment

For Mirrodin! (When this Equipment enters the battlefield, create a 2/2 red Rebel creature token, then attach this to it.)

Equip abilities you activate of other Equipment cost {1} less to activate.

Equipped creature has double strike.

Equip {3}{R}{W}

Illustrated by Tony Foti

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Brass Knuckles (Commander Masters #372)

Brass Knuckles {4}

Artifact — Equipment

When you cast this spell, copy it. (The copy becomes a token.)

Equipped creature has double strike as long as two or more Equipment are attached to it.

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

Illustrated by Yeong-Hao Han

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Fireshrieker (Commander Masters #949)

Fireshrieker {3}

Artifact — Equipment

Equipped creature has double strike. (It deals both first-strike and regular combat damage.)

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

Illustrated by Christopher Moeller

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Gavel of the Righteous (New Capenna Commander #83)

Gavel of the Righteous {2}

Artifact — Equipment

At the beginning of combat on your turn, put a charge counter on Gavel of the Righteous.

Equipped creature gets +1/+1 for each counter on Gavel of the Righteous.

As long as Gavel of the Righteous has four or more counters on it, equipped creature has double strike.

Equip—Pay {3} or remove a counter from Gavel of the Righteous.

Illustrated by Milivoj Ćeran

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Grappling Hook (Commander 2017 #212)

Grappling Hook {4}

Artifact — Equipment

Equipped creature has double strike.

Whenever equipped creature attacks, you may have target creature block it this turn if able.

Equip {4}

Part tool, part weapon, part of the kor.

Illustrated by Philip Straub

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

The message was clear to Sorin—time to search for something else.