I'm having trouble reading your card:
Is it 6
to play the card and 4
for the Gravity pull. also the damge I assume is 4 for the Hannon?
If possible it would be better to write like this:
Hannon
Cost: 6
Attack: 4 Damage
Ability: Gravity Pull:
Target Creature gains Gravity Pull
Otherwise nice card and good use of Gravity's ability.
I am unsure about how useful this would be in battle but can definately see its uses.
(always liked Gravity Pull on my Photons)
Nice work.
Scyther