When I started learning how to play, this little fella was a great friend of mine and helped me learn fast effects and timing. He was a staunch defender with the kickback of sacrificing him to make another creature just as good at defending. However, his true strength was in his hidden talent. Both of those things all rolled into one.
Imagine an opponent with a 2/2 starting his attack phase with a 1/1 and Armor Thrull as your defenders. Would he attack?
Sacrificing the Armor Thrull as a fast effect, targeting the 1/1 and blocking with it is an effective play. You could even block with the Armor Thrull straight up, force the opponent to waste cards to pump the attacker if he chose to kill it, only to sacrifice the thrull off.
What is important here was in the days of limited cards and resources, Armor Thrull the a king of options. Today’s game is a bit different (as well as the rules back then where you could block with Armor Thrull, sacrifice him and still deal the thrull’s damage to the blocked creature). Black even has spells that help bring him from the graveyard and back into play.
Granted, My friend Armor Thrull is quite old and isn’t something you would even find in commons boxes nowadays. Just thinking about an opponent thinking desperately about my pulling the trigger on this creature brings a smile to my insides.