As they learn the market, they can adjust prices if needed, buy and sell
What cards will be going into your decks
On Trainer cards it will always be found in the very bottom left hand corner of the card and for Energy cards it will always be in the top right hand corner, next to the word Energy
There's a small window for opponents to break even on card advantage, and after that window closes, your deathtouchers, sacrifices, and regular combat turn into so much value that very few black decks should go without it
One pick thats a little interesting here is Izoni, Thousand-Eyed
If those creatures are all still legal targets as Fireball resolves, it deals 1 damage to each of them