First and foremost, the best of these effects is to tutor any creature from your library, onto the battlefield
This sees a little sideboard play in Modern and Legacy, though, so theres a chance
In the late game, when youve already got plenty of creatures, it helps finish the game by making your entire team larger and giving them vigilance so you can freely attack without worrying about dying on the crackback
First place to look: The Soul Stone, the sets headliner, which received both a textless cosmic foil print and a gauntlet print exclusive to Collector Boosters
Heavily discouraging opponents from attacking you, but not in a way thats so obviously threatening that it demands removal, is powerful
The classic Vault Boy wreaking havoc with what looks to be a missile launch button is something that many Fallout players would love to have in their collection