There are 5 common, 5 uncommon, 6 rare, and 5 mythic rare SPE Welcome Deck cards
You should already be looking for the walking moxes that are green's mana creatures, so supplement them with artifact mana and a range of efficient, beefy green creatures at all points on the mana curve
Cards like Red Card and Mars have spiked in popularity strictly to keep strong monsters off the field as much as possible
When it enters the battlefield, it taps, and you look at the top four cards of your library, exile one face down, then put the rest on the bottom of your library
Players need to be able to adequately set up their board so that they have multiple attacking options throughout a game while also having crucial supplementary cards available
As far as prize support goes, this can vary from store to store