1mana monsters

Gremlin: Compares well to Boomboxen actually. Here are all the Effect devices (listed by speed; no speed are not listed):

EDIT: because masa has to be Mr. Point-Out-the-Flaw-in-the-Reasoning-and-make-me-work-harder:

So C speed for Gremlin's ability maybe?
The biggest objection I see to this ability involves Graviton Sword and Decelerator: effects can be reduced to E speed and made Gremlin counterable.

Skyrian: At least 2, unless you have sniping this can become an ultimate defender if not killed immediately (think Tsuitachi Ninja). At least with 2 cost you can't maintain 5 Skyrian's resisting attacks (would like to keep it at 3 cost due to usefulness with a Sudden Energy).
In support for a lower cost though, this is the perfect anti-rush card the way it is. Cheap and with undizziers unstopable by brute force alone (which can also be made the case for uping the cost >_>).

Kelar Citizen: It is VERY difficult to balance generating. 1 for Kel'sor being out is too insignificant while 2 is too good (with multiple Citizens out anyway). Web didn't like the "change to soldier" idea and I'd have to agree on the same grounds as not making Lifetimer unique + ability for spell immunity: overly complex and too far from original concept.
Both Citizen's current ability and the other one web proposed of "into play, random effect put to top of your deck" indicate an effect-based orientation; so ideas should be along those lines (if not for the difficulty of balancing it, the generate when Kel'Sor is out idea would of been perfect).