Summon sickness. It wouldn't be able to live. Of course, buffs could be used to save it, but I feel that the upped should be X+1.
It takes into account creatures damaged before the creature was played, and the effect takes place before the attack. See Swarm.
I'm not sure if the game can even remember which and how many creatures have taken damage. A phrasing like 'number of creatures on the field with less than full HP' would work and is functionally the same, minus the intervention of a healing creature, like Guardian Angel.
I disagree. The game can keep track of the full HP and current of HP of all creatures. The game just needs to be able to check all creatures currently on the field and check if full HP =! current HP, then change stats accordingly.
And, the way I see it, if a creature has taken damage and has been healed fully, it has not 'taken damage' because it's full HP equals it's current. It is also not meant to check creatures that have died (i.e. no longer on the field)
We'll most likely see this card in a / duo deck. Gotta love your Thunderstorms and Sky Blitz's. MAKE THIS THING AIRBORNE.
Yeah, it's airborne. Adding that to the notes.