Whenever Drakuseth, Maw of Flames attacks, it deals 4 damage to any target and 3 damage to each of up to two other targets.
Edit - "Although the new creature is attacking, it was never declared as an attacking creature (for the purposes of abilities that trigger whenever a creature attacks, for example, such as those of Trusted Pegasus and Makeshift Battalion)."
Well that's no fun. Its still a good addition to that sort of deck I suppose on account of being 7/7 and flying.
(1) inelegant text - as somebody posted, why not just 3 lightning bolts?
(2) totally imbalanced in limited. There is just no way of recovering from a reusable one sided board wipe that is dealing you 7 damage.
(3) probably not playable in constructed.