It is possible to construct a deck with more than 30 cards in it

[Patashu]

You cannot play with a deck with more than 30 cards.

• https://www.reddit.com/r/hearthstone/comments/4gdtqw/i_just_made_a_516_card_deck/
• https://www.reddit.com/r/hearthstone/comments/4d6r83/funny_bugs_thread/
• http://us.battle.net/hearthstone/en/forum/topic/20744904746

[Patashu]

https://www.reddit.com/r/hearthstone/comments/4j4zob/weird_tavern_brawl_gltich/

Might be a way to do it with the 'Top 2' Brawl glitch that modifies your other decks?

[culinko]

Patashu: This might be related to #521, see here: https://www.reddit.com/r/hearthstone/comments/4iw9yy/bug_editing_a_play_mode_deck_after_making_a/d31msp8.

[culinko]

Another report: https://www.reddit.com/r/hearthstone/comments/4kpbbl/33_cards_in_a_deck/.

[Patashu]

Another report: http://us.battle.net/hearthstone/en/forum/topic/20744904746

He reports that you have to do this:

• Remove all deck of cards
• Add everything except Warlock
• Add a deck of Warlock (normal)
• Exit from the addition taking Autocomplete
• Returning to the deck, it will be empty (with 97% probability)
• Restart the game, remove (or not to remove a deck of Warlock)
• Go to the deck and add again to the empty
• Restart the game
• Either empty or crowded

In rare cases, a correct operation and a deck running Sometimes it helps the creation of 2 decks, and then restart and deck 1 will be exactly full

[Patashu]

Report in 5.0.0.103 with repro instructions:

http://us.battle.net/hearthstone/en/forum/topic/20745114596

[culinko]

Another report: https://www.reddit.com/r/hearthstone/comments/4pzx7f/you_are_1_card_short_of_a_deck_what_do_you_do/.

[Patashu]

https://www.reddit.com/r/hearthstone/comments/664wb5/cant_explain_this_bug/ Looks current in 8.0

[troggnostupidhs]

https://www.reddit.com/r/hearthstone/comments/b9oaej/the_new_invalid_deck_graphics_are_nice_and_all/

On creating the deck:

It was a long time ago, I think during Year of the Kraken or whenever they introduced deck codes. I think I used a deck code and clicked really fast after.

It might not be an issue at the moment, because I kept the deck for novelty purposes.