Not much is known about Shadowmoor yet, but according to salvation we'll be seeing this card soon:
Grim Poppet 
Artifact Creature - Scarecrow RareGrim Poppet comes into play with three -1/-1 counters on it.
Remove a -1/-1 counter from Grim Poppet: Put a -1/-1 counter on another target creature.
Beware a scarecrow bearing gifts - especially sloshing vessels of acid.Illus. Kev Walker 4/4
What are your opinions on this card versus Trike? A few differences made me take a good look at this card.
Pro's
This card becomes stronger when you remove counters (-1/-1 instead of +1/+1 counters on Trike)
This card can save you from a DSC (put 3* 1-1 and block with 4 defense), weld it back do it again until it's either dead or small.)
The -1/-1 counters are permanent whereas Trike damage disappears the next turn.
It's a scarecrow
Cons
This card can't damage players
7 Mana
There have to be creatures to dump counters on in order to make him a beatstick