If you're new to Pioneer on a tight budget and looking to play in Pro Tour qualifiers, the Boros Heroic deck and Mono-Blue Spirits are the two most likely choices
Full of beefy characters and direct damage actions, Steel is one of the most straightforward ink colors to understand
Kairi has Ward 3 and can either bounce non-land permanents or put two instants and/or sorceries back into hand
While the Phyrexians are beloved by some, they're polarizing characters, meaning there was a swath of players that disliked the set for all the things I just noted above
Her ability reads as follows: Other Enchantment creatures you control have menace
To keep this list simple, we're only including cards you can pull from Play or Collector Booster packs, meaning no Jumpstart, Promo or Beginner Box creatures were factored in for this list