Engoldenate

Engoldenate, or Engoldenation, is the act of converting one of the Tromboner Cards into an Engoldenated form by combining 10 of the same card into one. Engoldenating is tied to 2 achievements, I DID ENGOLDENATION and ENGOLDENATION GOD.
Once you have 10 or more of the same card, you will see the Engoldenate message appear on the card's screen as seen below. Selecting and confirming this will combine the 10 cards and give you an Engoldenated version.
You will know that your card is Engoldenated when it has a gold border instead of a blue one. See the gif in the top right corner of this page to see the difference between a normal and Engoldenated card.
Once a card is Engoldenated, you will not find it in sacks. If you try to Turd it, you will see the message below. Turding an Engoldenated card will remove the Engoldanation, meaning you will have to collect 10 cards again.