We dont know much about the Willpower League yet, but it is described as a King of the Hill-style endurance test, where you need to win games to hold [your] seat during the event to win prizes
The best part is, as long as Magic keeps being printed, there will be new bird creatures created
Dont take the chance of purchasing investment grade booster packs in any other way as loose booster packs sold without this type of security can be risky as many loose packs out in the wild could be tampered with or do not give you the best chance of pulling a holofoil as many booster packs are sold after most if not all of the holofoils have been pulled from a box
The game's main antagonist, Ultima, saps away the land's mana, rendering magic unusable and causing life to wither away, thereby making certain areas uninhabitable
These cards are also all Full Art types - so be patient, it might take multiple pulls to get any of them
You also have a lot of other options if you want to play Commander, so the choice here depends on your budget