I do just fine with a go 2nd team and that gear is far easier to farm. You need to farm a lot of equipment pieces to get good speed without using speed primary stat boots. To get high speed you also need a lot of credits even if you use speed boots. I had a few speed champions early on but they have been refitted. I got to 154 speed with level 12 speed boots.
A 159 speed team is really not all that fast either. That is achievable with 1 set of speed boots to level 12.
Easiest to build with farmable champs? That makes no sense. Are you referring to the 3 speed from faction guardians? That bonus applies to every rare in the faction. I am referring to going to dungeons to farm, which requires an awful lot of energy a newb can't afford to spend. Without getting high rarity equipment you can't possibly get a lot of speed from substats. If a newb spends his energy farming dungeons he is going to permanently delay his progression.
No matter what champions you use they can be useful in other content.
May I guess that your froum registration date is close to the date you started playing Raid? You are an early game player and you, sorry that I have to say so, talk about things you don't understand (yet).
You don't even understand, what a speed team is. Balltazer wanted to explain, that the nuker of his speed team with only 159 is exeptionally slow - but it still works. A speed team is not "use 4 attacking champs and make all of them as fast as possible, so they all get a turn before your opponents". A speed team is a team where one certain champ, like High Khatun or Apothecary, or Lyssandra, or Arbiter, or Gorgorab, or Seeker, or whoever has an ability like this, uses her speed and turnmeter buff onto the other teammembers, so they can go before the enemy even if they are as slow as 159 speed.
A speed team can be built from free champs.
- Khatun as speed buffer, free day 30 log-in reward. Or Diabolist, campaign farmable in stage 12.
- Decrease def on all enemies before you attack. Warmaiden, farmable in campaign stage "the Deadlands"
- Starter champ, obviously free obtainable by everybody
P.S. You still did not tell us wich champ, easily obtainable from green shards, would be better than the starter champs as first lvl 60.