You get Wildcards by opening boosters, competing in events, and winning games to beat your daily and weekly challenges - so if you're short on Wildcards for the shiny new Arena deck you want to build, the best thing to do is get playing with the decks you already have
it's also not a color often used in Equipment strategies (though this is changing)
In general, I think Asmodeus will sometimes feel like more downside than upside in Limited, but the amount of power he brings Is pretty amazing, though certainly not bomb level
Similar to single card prices, the price tag on booster packs varies greatly
Jeskai Revelation deals 4 damage to any target
It's also a good resource for figuring out how much your cards are worth once the new set is out, so if you pull any Surge Foil cards in your booster pack preorders, you might suddenly find yourself with quite the nest egg