Anyways, read my article about how Aggro is Really Good in Commander Right Now
Bruise Tarl will give target creature you control double strike and lifelink until end of turn when he enters the battlefield or attacks
It enables infinite loops with creatures like Bladewing the Risen or Sharum the Hegemon, and it sets up an easy target for Sun Titan, which nets you another copy of Titan when it enters the battlefield
Sadly, this likely means that Festival in a Box, and Mystery Booster 2, will be incredibly difficult to get ahold of
Its a really terrible resource swing when your opponent spends 2 or 3 mana to counter a spell youve spent 4 or more to play
Stack enough Wild Growth variants on your lands, and you have Bear Umbra doubling your mana