For example, if your opponent has 2 Digimon and 1 Tamer, this adds up to 3 cards total, which means you get to reduce the play cost by 9
For three mana, you can combine Cutter, Bauble, and Phoenix to create a 6/6 Flying Hasty Trampler
If you and ChannelFireball are selling for the same price, in most cases the buyer is going to choose the established brand over a random seller
I find myself holding it a lot but it is a pretty nice card to be sat on (unless you are mana screwed and are holding a bunch of other top end...)
Q3: are there different styles available
And most of the time each of these versions is available in both foil and nonfoil, but sometimes not