4 types of shards, 4 pieces of equipped gear, feather and potions leaves 4 slots open for quest items. No room for anything else. This is a serious issue. Equipped items shouldn't take up inventory spots, neither should the spell components.
It would be nice if cards of the same type simply stacked when your building decks. That would make it a lot easier to see all of what you have, especially since they sort buttons don't seem to sort them very well.
For new players, Tyrant 101: Skip Arctis raid. Don't join any of the other raids until you have done most or all core missions. Use your gold to buy gold packs. Don't sell ANY cards. Save your WBs! They're precious and best used for specific cards once you know the game. Never WB a card which can eventually be gotten with gold. There's a wiki which lists all the cards, do a search. I loathe rate up requests but this will mean I can stop telling every new player the same things, so please do so.
 "Burrito Bison Revenge"){kind=icon}
 "Fancy Pants Adventure: World 3"){kind=icon}
 "Snailiad"){kind=icon}
 "Backyard Monsters (removed)"){kind=icon}
 "Burrito Bison"){kind=icon}
 "Snow Bros. - Nick & Tom"){kind=icon}
 "Castaway"){kind=icon}
 "Cardian"){kind=icon}
 "Tyrant"){kind=icon}
 "Billy the Pilot"){kind=icon}
 "Turkey Fling"){kind=icon}