GWENT: The Witcher Card Game

I got this when using Kayran in a Monster deck.
It's a gold costing 800 for the regular version (can't buy premium anymore).

It has Zeal and 3 order charges to consume allies. So play it once you have three allies on board and trigger it three times straight away. This will give you at the same time:

This is fairly hard to set up, unless you have the right cards. I used Geralt: Aard for this, as his Deploy ability lets him attack 3 units and do 3 damage to each of them.

Once you have him in your hand, it's a matter of waiting for an opponent to actually play three cards that can be destroyed by him.

You can also use cards with Consume abilities and just destroy your own cards. Anything with enough Consume charges would do the trick.

The hardest part of this achievement falls between getting lucky enough to draw the right cards, or having a unit survive long enough to fulfill the requirements. Personally, I got this while playing naturally, so unlocking it while going for other achievements is probably the preferable route.