Highlander / Singleton

Singleton decks avoid cards with the same name, usually for a no-duplicates bonus. Highlander means the same thing.

This is a deckbuilding rule, not a speed. A singleton deck can be fast, slow, or mixed. Its name alone is not a reason to build one. You need a useful reward in the allowed card pool.

Fill the same jobs with different cards

A normal deck can use two copies of many early cards. A singleton deck needs different cards to fill those jobs. Count early minions, removal, draw, and winning cards by what they do. Thirty different names are not enough.

Tutors can help find a key card, but a single copy is still limited. You may need to save it carefully.

Read when the bonus checks your deck. Checking the starting deck differs from checking the current deck. Added or shuffled cards may affect one rule but not another.

Strengths and weak spots

A strong reward may make up for less reliable draws. A range of answers can help against different decks.

But uneven draws and missing second copies can leave gaps. Disruption hurts more if it removes your only finisher. Compare the whole list with a normal two-copy deck. Count the weaker cards you had to add as well as the big reward.

To plan draw and consistency, count different cards that can fill the same needed job.