A: No, that doesn't work, even in Mystery Booster
Since Timber Wolves is a rare, thats nearly impossible to accomplish unless you have ample copies of either Heroes or Pegasi to work with
To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions
Despite being a part of the "A" set, it clearly won't be here until later
Though your own critters are going to be caught in the crossfire, a Ygra deck is likely built with disposable (or indestructible) creatures in mind, keeping important cards alive with Gyome Master Chef or profiting from their destruction with Marionette Apprentice
The standards are somewhat high as theyre looking for mint condition cards, but it absolves the seller the hassle of selling small-time cards for $0.50 on eBay and having to pack them up and ship them out one at a time