After looking at other aggro decks I have deicided to:
Remove 4 Firedrinker Satyr and put in Tormented Hero
With Red Burn decks coming into the format, I don't think that the life loss is beneficial for the pump as you help them too much. The Tormented Hero is very similar as a body but has the benefit that, if needed, I can use a spell like Madcap Skills (or Lighning Strike should things get that bad) to gain a potentially vital point of life.
Play 4 Madcap Skills
The other alternatives consist of other creatures (most aren't very good) or more removal spells. I went with Madcap Skills as it almost does the same as a kill spell in that it means a creature is very unlikely to block that early on in the game (as they won't have many) but it also gets in 3 more points of damage, which can be vital for this deck.
Play 4 Lightning Strike
This one is more simple. It serves as a kill spell that can go to someones face and hopefully kill my opponent.
Take out 1 Pain Seer and put in 1 Thrill-Kill Assassin
The Pain Seer does give me cards however the Thrill-Kill Assassin has deathtouch so is much better with the addition of Madcap Skills. It also provides a 2/3 body (assuming I unleash it) which is more resilient when my opponent blocks, keeping me a creature (and some more points of combat damage).
