Coming back from the yard pushes Unstoppable Slasher over the top, though fun fact: If you put a -1/-1 counter or stun counter on it (or any counter, for that matter), then kill it, it wont come back
You could try and use this card as a starter type Pokemon and use Oblivion Wing many times while setting up your benched Pokemon or you could set Yveltal up on the bench, put three energy cards on it and later in the game when you have plenty of energy cards in your discard pile you could move it into the active Pokemon spot and use Oblivion Wing to get those energy cards back, or you could use Darkness Blade to try and knock out your opponent's active Pokemon in one move
Whether it be through a creature recursion engine like Tortured Existence, or sacrificing multiple creatures through Carrion Feeder
For just two mana, you can copy any enchantment you control, even making the copies nonlegendary so they don't get sacrificed
I dont think you can compare any current release to Commander 2011 , though