Incinerator not only draws you a card for an affordable cost, but it also serves as removal, dealing X damage to a creature, where X is the amount of goblins you control
Now, the two preceding sets were pretty laser-focused on creature type synergy, and while Scourge largely continued the pattern, it did a couple of things differently: it featured Dragons and synergy with cards with high mana values
Actually a lot of decks may ignore Wrenn and Six since theyre either faster than its minus 7 ability or Wrenn and Six just doesnt have the impact to deal with any creature theyre presenting
The One Ring's controller takes damage each upkeep from the burden counters, but who cares
You basically draw two extra cards on your draw step and you can then choose between paying 4 life for each card or returning them to the deck
Why let your opponent have access to a graveyard when you can just exile it all