GWENT: The Witcher Card Game

This is a good method for this achievement that requires only spending a total of 280 scraps - just 2 cards needed (credit to KPinJo on reddit).

First create a Nilfgaard deck with Emhyr Var Emreis as the leader. Emhyr is unlocked through the tutorial.

Then you need to create the following cards: 1x Necromancy (cost: 200 scraps), and 1x Rot Tosser (cost: 80 scraps).

*Necromancy allows you to play a bronze unit from your graveyard.
*Rot Tosser, when deployed in the ranged row, spawns a Cow Carcass card.

Fill the rest of the deck with whatever you want.

Once in a match play a Rot Tosser in round 1 on the melee row. Use Necromancy to resurrect it in another round and play it on the ranged row. Then replay it with Emhyr on the ranged row again.

This way you'll play 1x Necromancy, 2x Rot Tosser and 2x Cow Carcass for a total of 5 cards in 1 turn.

The achievement should unlock right away.

Edit 2019 -

- You will now need 1x Necromancy, and 2x Rot Tosser cards in your deck for this method to work.

- It seems that an update to the game somewhere down the line has made it so that when you use Necromancy on a card, it makes the card Doomed (this was not the case when the game first released). So when you move Rot Tosser to hand with Emhyr, Rot Tosser is removed from the game and you can't play it again.

- This method will still work as long as you have a 2nd Rot tosser card in hand and play it with Emhyr's ability instead.

Edit Late 2019 -

- Selecting a "leader" for your deck has been changed. You now select an "ability". The leader Emhyr Var Emreis is now called the Strategic Withdrawal ability.

I did this with the next combo:
Leader: Francesca
Royal decree, dandelion poet, any card in your hand, activate your leader ability and replay royal decree, prince villem.
Prince villem is very good if royal decree it's the only gold card in your deck, so you can play it easily, I got it in my first try