Keldon Battlewagon can't block.
When Keldon Battlewagon attacks, sacrifice it at end of combat.
Tap an untapped creature you control: Keldon Battlewagon gets +X/+0 until end of turn, where X is the tapped creature's power.
I used to have a lot of fun with Keldon Battlewagon , though it's pretty useless most of the time. Tap him last and boom :)
IMO, you should run the following artifact ramp package:
I feel that the following fit your theme:
I would cut:
I don't like playing hugs style decks, so I would remove the following due to personal preference:
Other cards you may consider:
|0.05 TIX||0.75 TIX|
|Power / Toughness||0/3|
|Avg. draft pick||1.08|
|Avg. cube pick||7.56|
|Commander / EDH||Legal|