Elspeth and Underworld Rage-Hound have clear potential applications as attrition winners, but they require a nontrivial amount of cards and extra mana, restricting their ease of use outside of fairly long games
With the living weapon ability, it creates a creature token and attaches to it (a precursor to the Job Select mechanic from the Final Fantasy set)
Does Regenerate Stop Combat Damage
A couple extra cards have tipped plenty of commander stalemates, and lets be honest, a surprise Molten Primordial or Resolute Archangel is not only fun to pull out, its going to screw up combat math in a big way
Glimpse the Unthinkable is a two-mana Blue and Black sorcery that has a player mill ten cards
Since his origins are a bit muddy, Turlough doesnt have the creature type Alien or Human