Chains is the ideal meat shield when going first because it has relatively high defense (1800) and has an effect when sent to the graveyard, paying you back when the opponent kills it
Before you ask, yes, the bog is fine and expected to have no permanent injuries
As for specifics, a recent Pokmon blog post confirmed some of the highlights from the expansion
Note that digivolutions from cards with non-[Gammamon] card names are possible using digivolution requirements or this card's special digivolution requirements
[spoiler=Combo#3] Cards needed in hand: Flush (or Casino Royale to search) Any Draw card (Four of a Kind, Royal Flush, or Casino Royale to search for Four of a Kind) Steps: Activate Flush to topdeck Diamond Use your draw card in order to reveal and summon Diamond Use Diamond to search for Casino Royale
I mean, sure, its only five mana more and returns to your hand when it blocks, but at least Zephyr Spirit gets one more point of toughness