DailyUI #004 - Yugioh Life Point Calculator

Daily UI Challenge #004:
The prompt was to create a design for a calculator so I decided to make one for the TCG Yugioh. I think this would be helpful to keep track of life points while playing against an opponent. I chose to design it for phones since that is what people would be most likely to use when playing with friends. I chose basic colors that were similar to the Duel Arenas from the anime.

Prompt:
Design a calculator. Standard, scientific, or specialty calculator for something such as a mortgage? Is it for a phone, a tablet, a web app?