Feedback - Dice Roller, Host Tab, Rulebook
Change the goblin to a more recognizable MTG character or icon
merge join/host tabs into one, they are identical, no reason they can't be on the same tab.
Add a dice roll to the life counter, brighten the physical colors up and change the con flip animation to an actual heads/tails. or put "heads/tails" on the icon it lands on.
Make a rulebook/judge tab so players can have access to the rulebook via hyperlinks (similiar to MTG Rules app on android), on the bottom half, put access to judge points of contacts that players can get familiar with in recognizing their positions at events.