Those could be obtain by running and reporting 10 sanctioned tournament either for draft or sealed
You can have more, but I recommend sticking as close to 40 cards as possible while aiming for a ratio of 24 playable cards to 16 lands, adjusting for your curve as you see fit
In order to bargain a spell, you have to sacrifice either an artifact, enchantment , or token
Yes, a goaded creature will trigger effects that care about whenever this creature attacks
For example, the Base Set Charizard was unevenly distributed in Base Set booster packs, which made it even more elusive
Once you get Asmo and The Underworld Cookbook in play, discarding cards to The Underworld Cookbook will net you Food tokens that you can use to remove opposing creatures thanks to Asmos final ability