In burn decks you can either deal 4 damage to the face, give double strike to a card like Monastery Swiftspear, or protect your creatures from a sweeper
Abilities that trigger on damage being dealt will trigger if a source with infect deals damage, if appropriate
Incredibly simple and straight-forward, it tends to be one of the first combos anyone getting into Magic learns about
Very potent card draw tool in the right setting and sufficiently threatening as such that he will draw a lot of removal
You have to rely a lot on drawing Kodama of the East Tree or another enabler and you don't have quite as much redundancy as you'd have in a deck with maybe a half dozen Walking Atlases and you can't use Murasa Rootgrazer basically at all, which is a shame, but you can still generate a ton of value in ways Blue decks can't
A good way to compensate for only having one is to play it with some burn so that you can realistically burst someone down without having to attack