Not only do they prevent your permanent from being removed, but they also allow you to point that removal elsewhere
Bouncing back to your hand isn't as bad as sacrificing a creature, but the effect still sets you back in a big way and can be followed up with a nasty counterspell
Peter Parker / Amazing Spider-Man or Surris, Spidersilk Innovator / Surris, Silk-Tech Vanguard The Amazing Spider-Man, now there's a 4/4
Some non-Standard sets come in booster boxes with exactly 24 packs, as if the intended use for a draft was not already clear
While Green usually doesnt need the help, sometimes you run into an opponent that stops you in your tracks
Untapping creatures is very synergistic with the station mechanic since it allows them to tap again