plasmid

If the "it" that they were looking for and found in fire, earth, water, and air is the letter R (the only letter that they all have in common, which is also in the words master, warrior, bender, avatar, and "lion turtle"), then the warrior has it first out of all of the characters - at the third letter.

if I'm a precipitate

For each set of six cards:

The first card will give information about which of the suit pairs should be guessed for the next five cards. If it's up, then the guesser should guess either diamonds or spades. If it's down, then guess either hearts or clubs.

For each of the other five cards: if the card is up then guess whichever red suit was specified (either diamonds or hearts), and if the card is down then guess whichever black suit was specified (either spades or clubs). You will get at least 3 of the 5 cards correct.

If you got more than three out of the five cards correct, then great, you're already getting at least 2/3 correct for that set of six! If you didn't (meaning that 2/5 of those suits were not the suits specified for guessing), then look at the orientations of the two cards that were not in the predictable suits. Since they were going to be missed anyway, they are oriented to give you two bits of information - and those two bits of information will tell you the suit of the first card in the next set of six. So ultimately, you'll end up getting at least 3/5 correct from the first set of six and you'll get the first card correct out of the next set of six, so you're still on track to get 2/3 correct.

In a real deck, 6*8=48, so using this strategy with the first 49 cards (since sometimes this strategy will lead you to predict the card after the set of six under consideration) will guarantee that 4*8=32 of those are correct. Remember that the orientation of card 49 isn't specified by that strategy for sets of six so it can still be either up or down, so the orientation of cards 49 and 50 can tell you the suit of card 50, and you can get 51 and 52 by counting cards and using the strategy outlined before. That gives you a total of 35.

Assign numbers to the suits: spades=0, hearts=1, diamonds=2, clubs=3. Plane orientations are assigned a number: plane up=1, plane down=0. The player who orients the cards will indicate the suit of every other card by using the orientation of two cards. Take the orientation of the first card of the pair as the first digit in a binary number, and the second card of the pair as the second digit of the binary number, and that binary number indicates the suit of the second card. For example, if the second card in the deck is a diamond (=2, or in binary 10) the first card's plane will be pointing up and the second's will be pointing down. Using that strategy, every other card will be predicted correctly.

Use that strategy for the first 50 cards. Once you're down to the last two cards in the deck, they players will need to have counted cards, and they should know the suits of the last two cards. For the 51st card, the code changes to be: plane-up means the 51st card is the higher numbered suit of the two remaining suits, and plane-down means the 51st card is the lower numbered of the two remaining suits. They'll be able to get both of the last two cards correct, for a total of 27/52.

making hand shadows, nor grilling hot dogs, nor describing two Frodo Bagginses being simultaneously bitten by gollums at Mt Doom

a crown, with a central red tuft surrounded by prongs