Scout's Warning leads to surprising plays by letting you give flash to other hate cards like Elesh Norn, Grand Cenobite and Thalia, Heretic Cathar
When you pick up an early unfair card and begin building around it, ask yourself what kind of overall deck your card thrives in, and keep an eye out for other unfair cards that also work well in that space, even if the two cards aren't direct analogs in the way Counterspell and Mana Leak are
Combo is weak and uncommon, there is lots more removal floating around and a 2/2 will just trade badly with any number of similar dorks that have already obtained card advantage (Snapcaster, Trinket Mage etc) or sit on the sidelines and do nothing compared to actual threats people might make
Why do you need to draw the nonland cards
Do I Need to Distinguish if I Morphed or Megamorphed My Creature
Its a tiny nod, but one that subtly connects the entire SOLDIER program to the +1/+1 counter ecosystem in the set