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)
Maybe, but the very word nothing breaks down into no and thing
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
References [edit] "Money, Proxies, and the Must-Have List - A Case for Vintage"
(Although spikes are special in that they got a special preview card in Spike Drone.) This is how the spikes ended up in Stronghold