This doesn't need the ugly power/toughness box. (In fact, it doesn't work that way.)

Since it is usual that this will be a creature, it might be clearer if the text said "for each other creature you control named...", like Timberpack Wolf.

Which is also a funny point to raise. That one costs two mana and was green. I feel the blue one could be bigger. If it's a Hill Giant, being blue, it won't be picked as highly as the Wolf was in M13. That makes the ability more relevant, and can easily lead to a big army situation similar to what a Harbor Serpent could cause.

Changed wording but keeping at +2/+2 for now

FYI, if this is to be drafted with other sets, it will make it a lot harder to have more than one. Maybe change it to care about a tribe.

(Saying this because it's not attractive in Constructed, no matter how casual.)

dropped cost by to make it a it more attractive