It does not. Only warlord

Does the Warlord train follow him with this card?

I like the art and the name. But the cost i feel is too much for the units it can target.

Is this a good card? Is it mediocre?

rate_review Card Review: Rated: 4.75
Simply very good core card. Usefull even in non Chaos decks, that like to import some non - loyal Elites (Venomous Fiend, for example). You can put 5 cost Elite unit with this and STC Fragment for 1 or even 0 (with 1 more Cultist). Can provide 2 weak combat 1/1 units (not recomended)
(-) Without Daemon keyword Armies - not very usefull card; 1 shield (with 2 this can be too broken, heh); Deploy Action only.
(+) in most Chaos Midrange or Elites decks - very usefull, even mandatory card (large part of Alternative Economy); versatile and strong card, enabling many ways of additional economy.
Combos: Ancient Keeper of Secrets (in most lucky parts - 2 additional attacks); Daemon summoning (most and often usage); can be fodder for Smasha Gun battery in some cases (and for a lot of indirect damage income) .
(=) This card in 95% procent of my Chaos decks ( and in 100% of my Competetive decks) :P

rate_review Card Review: Rated: 4.5
Very cool card; seems dangerous and costly to a lot of players, but can win battles and games in my experience, also synergies with a lot of cards (Brutal keyword; Nazdreg; Kugath) and if you have attachment on unit (any, even humble Promotion) this Army is safe from Energy of Change.
(+) - good with decks, that can run attachments; good with decks, that can "tank" damage or move it; good with Zarathur (3 dmg to any units on planet with him), but Warlord himself is vulnereble to damage.; can target enemy HQ; non - loyal.
(-) - costly; not for all chaos and allied decks; one shield icon; attachments are worst type of cards, from my game experience - hence, for most part you blast you units also for most part.
(=) I love this card, not universal, but can be Brutal (in all cases) surprise for you enemy.

No Improbable Runt Machine in a Zogwort deck?!
I can't believe it. This unit is fantastic, and makes Zogwort far far more in pair with strong warlords.
https://www.traxissector.com/en/card/?card=DOF039

while i ended up playing Space Marines 5 times in the swiss and cut, which is what i had it in there for, i never really needed to use it. I did play it one of my games to set up a klaivex on a dreadnaught but i didnt really need to.