If you want to know what a single card is worth, simply search for that card on either site
Every player gets two free packs a day
The general play pattern is to take players out one at a time with one large creature, prioritizing offing the players in order of who appears to threaten your board state/is most likely to win if left to untap
Yes, you can target an Oblivion Ring with another Oblivion Ring
The opportunity is that Charizard demand has proven remarkably resilient even through market downturns -- it was the first card to recover after the 2022-2023 correction and remains the most liquid vintage Pokemon card on the market
Remember, Khorne cares not from whence the blood flows, only that it flows. Obviously, the more that dies when this is in play, the cheaper it becomes, which just makes sense