6 cards where the text includes “a deck can have any number of cards”

Dragon's Approach (Strixhaven: School of Mages #97)

Dragon's Approach {2}{R}

Sorcery

Dragon’s Approach deals 3 damage to each opponent. You may exile Dragon’s Approach and four cards named Dragon’s Approach from your graveyard. If you do, search your library for a Dragon creature card, put it onto the battlefield, then shuffle.

A deck can have any number of cards named Dragon’s Approach.

Illustrated by Andrew Mar

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Persistent Petitioners (Ravnica Remastered #53)

Persistent Petitioners {1}{U}

Creature — Human Advisor

{1}, {T}: Target player mills a card. (They put the top card of their library into their graveyard.)

Tap four untapped Advisors you control: Target player mills twelve cards.

A deck can have any number of cards named Persistent Petitioners.

1/3

Illustrated by Jason Rainville

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Rat Colony (Dominaria #101)

Rat Colony {1}{B}

Creature — Rat

Rat Colony gets +1/+0 for each other Rat you control.

A deck can have any number of cards named Rat Colony.

Wreckage from the Phyrexian Invasion provided the rats with a seemingly unlimited number of breeding grounds.

2/1

Illustrated by Suzanne Helmigh

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Relentless Rats (Masters 25 #105)

Relentless Rats {1}{B}{B}

Creature — Rat

Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats.

A deck can have any number of cards named Relentless Rats.

2/2

Watermark: Set Symbol

Illustrated by Johann Bodin

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Shadowborn Apostle (Double Masters 2022 #89)

Shadowborn Apostle {B}

Creature — Human Cleric

A deck can have any number of cards named Shadowborn Apostle.

{B}, Sacrifice six creatures named Shadowborn Apostle: Search your library for a Demon creature card, put it onto the battlefield, then shuffle.

1/1

Illustrated by Lucas Graciano

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Slime Against Humanity (Murders at Karlov Manor #177)

Slime Against Humanity {2}{G}

Sorcery

Create a 0/0 green Ooze creature token with trample. Put X +1/+1 counters on it, where X is two plus the total number of cards you own in exile and in your graveyard that are Oozes or are named Slime Against Humanity.

A deck can have any number of cards named Slime Against Humanity.

Illustrated by Brent Hollowell

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.