I like it. But as for, say, mass CC like Thunderstorm the effect would be normal, or would the 2x adjacent creatures (for example) give another 1+ damage each to the trusting card?
Anyway, it seems like a bit of CC for light. It's interesting, but for some reason the mechanic that popped in my head with the name was:
"Target creature is now bonded with another creature. Whatever happens to one creature, happens with the other."
A bit like the old Voodoo Doll before it was implemented in the game (Search it up in the Reliquary, =P). Still, I like the card as is too, so I'm not complaining.