I will readily admit that by todays standards this piece leaves a lot to be desired, but at the time it was a first step into a deeper world
Bouncing every one of your opponents permanents can be extremely valuable depending on what youre playing against (such as, for example, Mono-Green Food or Gruul Adventures), and bouncing your own permanents can also be quite good, especially since some of the Giants-centric cards are Sagas (or potentially Yorion, though unfortunately thats not an infinite combo)
(Although spikes are special in that they got a special preview card in Spike Drone.) This is how the spikes ended up in Stronghold
Honorable Mention #3 - The Mirage Dragons Mirage Dragons Dragons were Red
This legendary yeti naturally strengthens his offense for a minimal mana investment, so defensive measures will be your primary concern once he arrives to the battlefield
Green Suns Zenith is banned for very similar reasons to Stoneforge Mystic