Over-pledge for the amount of the extra item. At the end of the campaign you will receive a survey (and BackerKit) where you can detail what items you wanted added.
Also, check the Add On Menu graphic for the exact amount needed for your over-pledge.
You and your friend may build off the same single game set, but both of you would not be able to play any of the same creatures or domains by sharing a single set. (i.e. you both wouldn't be able to use Wormwood, since there is only one available to choose).
It is highly recommended that every player has their out set to play with.
(Also, with only one set, you will not have enough dice or counters for 2 players)
You will get 1 of each stretch goal variant for each set of Squarriors The Card Game you order.
This does NOT include the retailer perk. Backers for the retailer perk will get the 10 Wormwood variants, and 1 of each stretch goal variant, per each backing.
IE. If you order 2 retailer packages, you will get 2 of each stretch goal variant.
IE. If you ordered the buddy bundle, since you will receive 2 sets of STCG, you will get 2 of each stretch goal variant.
Don't see the answer to your question? Ask the project creator directly.