What is the highest multiplier you can get and what is the dice threshold for it?

When you have less than 50 dice you can use up to x3. When you have over 50 dice you can use up to x5. When you have over 100 dice you can use up to x10. And if you have over 300 dice you can use up to x20. There may be higher, but that is the highest I’ve seen. (The highest dice I have had was 616)

They even have 100x when you get over a certain thousand of dice available

The highest I have had was 200x because I had the rice multiplier buff.

I have over 23K dice left and use a 500x multiplier

Not always a wise choice, but I've done it lol- when you have a large enough amount or dice for a high multiplier, just don't change the multiplier so even when you've dropped below the dice threshold you can still use the high multiplier

There is a 50 multiplier but I’m not sure the dice threshold to get it. Both times I’ve used it I had over 2000 dice.

Not sure how many dice you need to have but I had 17k dice and could do a X500 and X1000 multiplier.