Groups would shuffle up their standard decks and add ten Plane cards per combatant to the matchs Plane deck, which is either shared amongst all opponents or kept separate like an in-game sideboard
If you have a card in auction, you might be able to sell it for more than its market value
Balan's deck is packed with equipment cards, many of which grant trample so Balan's double strike can push even more damage and not be wasted on chump blockers
Weathered Runestone is a more expensive Grafdiggers Cage that also stops a wider variety of permanents, giving it applications against cards like Goblin Engineer and Replenish
It probably wont come up too often, but the Gossipmonger can tap another one that already flipped into Incited Rabble, in case we want to avoid attacking for a turn
Considering the latter of these rewards is worth $9.99, this promotion appears to be a slam dunk