On top of being a great creature on its own (its a mana sink that can deal small amounts of damage to pesky hatebears or other creatures), its a simple way to turn infinite mana into infinite damage at instant speed
Sapphire Steel is built around the Hero synergy, one I actually think has potential, but more in the Amber Steel deck
#4 Tainted Strike Scars of Mirrodin, Common Once again, giving Infect to creatures that normally wouldnt be seen anywhere near a Phyrexian is where the mechanic shines
Through the Breach, also in Travis deck, has begun to spike a bit too
Even if you weren't trying to strand a bunch of cards, the matches often turned into exhaustion wars to see who would have spells left over when the music stopped, and Goblin Trenches would blow such matches wide open
This opens up some serious possibilities, especially because of the artifact shenanigans that you can pull off