Because Mtg Arena uses Unity you can use Rich Text to add color to a lot of text stuff. | tcgmode

Link to the doc: [Rich Text](https://docs.unity3d.com/Packages/com.unity.ugui@1.0/manual/StyledText.html) You can make it bold or italic or change the size. To make it bigger I found size only goes to 28 for me. This works with chat messages as well.