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You can paste decklists into Hearthstone a day early
If you want to prepare decks ahead of time and know a website that builds deck recipes you can paste that recipe into the client and it will put ghosted out versions of the missing cards into your deck.
Here is an example deck string:
3 Darkness and 9 Candles Deck: AAECAf0EBskDxQTcCum6AtDBAvbqAgzAAZUDqwSBsgKCtAKwvALBwQKYxALHxwLezQK50QLN6wIA
This is a scary deck, let me tell you a bit of kobold lore you might not know.... The reason they wear candles on their heads is because they fear this thing they refer to as The Darkness. They believe it will get them if they lose the candles. This deck can simulacrum the darkness and make 3 plus 9 candles so they activate sooner. A literal nightmare for kobolds.
You No Take Candle!
Mike Donais
https://us.battle.net/forums/en/hearthstone/topic/20759488307#1
Mike Donais
You can press ctrl-v to paste while looking at a deck. You can also press ctrl-c to copy a deck.
On a phone tap the picture at the top of the decklist.
Mike Donais
They should always work. Eventually they will be wild decks.
Dave Kosak