1. Click "Hide Cards" and you can, and click "Show Cards" to get back to your mulligan. Its almost essential for Nilf players as you can also do this when using leader selection cards, spy with draws, etc. Edit: A good habit I've developed is instantly doing this at the start of the match. Its useful to know if you wanna keep your D bomb, scorch, clear skies, or whatever other situational card you may have for its utility, as well as ways to tweak your deck's strategy. I use rot tossers for example, which are great against ST and NR, but I'll typically mulligan all but one (or sometimes even the one) against SK.
2. This is also readily available. Cards in hand is on the left side by each players hand. Cards in deck and graveyard are on the right by the decks and graveyards.
3. So as for the potions and buffs, its usually easy enough to tell. There are only so many of these in the game. As far as the card that is banished you'll just have to know what's in your graveyard; you can right click it to check it and see what's missing. Part of the skill of card games and the like is knowing what's been played and what hasn't without readily having all of the information available. Spades or Hearts as a great example: you don't always know what spades have been played as books taken are usually kept face down, and you don't know if the Q of spades has been played in hearts unless you're paying attention.
