When you Synchro Summon a Power Tool Dragon, it picks only the good cards with AI's unique shooting skill and upsets the player, but it's usually dealt with before that, so it doesn't matter
It lets you choose whether you want to dish out 200 damage or discard and deal 330, depending on the situation and if you have a way to regain energy
What if you're forced to pay 1/2 a life
Then, once Lucario is set up, bring it to the active spot and begin a series of heavy duty attacks that few opponents can withstand for long
With the release of top notch delve cards from Tarkir, the delirium mechanic things, flashback stuff, recursive dorks, and even just an increase in good graveyard recursion effects there is a significant increase to the value of self mill