This set is pretty awesome, although some are much better than others.
Being able to tap down creatures is very important for an aggro deck and being able to do it more than once per turn is really good, Tap a dude, cast a dude, tap down another dude, swing. It can also be used defensively to lock down potential attackers. I'd have liked to have seen this at CMC 3 instead of 4 though. It comes in a turn too late for my liking.
Pros: Very repeatable blocker removal
Cons: Costs 4
This is the second-best out of the set. It fits in really well into a red burn deck. It basically adds an extra damage to each of your red spells. It's like a universal mini-Pyromancer's Gauntlet, only it doesn't cost 5. I would have liked it with haste, but I can't have everything I want.
Pros: Mini universal Pyromancer's Gauntlet
Cons: No haste
Eating graveyards can be really advantageous and this card is really apt at that. However, it's not always a good effect and that really holds this card back. I think this would have done better with giving out temporary -1/-1 instead.
Pros: Really efficient at eating graveyards
Cons: Effect has limited usability
This card fits into the same vein as Ballynock Trapper. It essentially does the same thing, except that it can't be used defensively. It sort of removes blockers from the equation by making your creatures flying, but without the defensive capability, it's just not that great. If it cost one less, then it might be better.
Pros: Hands out flying
Cons: Only hands out flying
THIS IS NOT A DRAWBACK! This card is the star of so many green aggro decks it's not even funny. A pseudo-vigilance 2/2 for 1. There's not really another card like it. Most other 2+ power creatures that cost one have some sort of drawback (like sacking a land or creature) or are rare. The fact that is at common is ridiculous.
Pros: 2/2 vigilance for 1
Cons: Doesn't fly