All your modified creatures get trample, and dealing damage with a modified creature lets you thin your deck out a bit by searching for a basic land and putting it into play tapped
This ability works wonderfully with unblockable creatures and your Ninjas, letting you sneak damage in, refilling your battlefield with a new creature that also has a form of evasion, while at the same time giving you a powerful blocker to deter oncoming attacks
Put that card onto the battlefield tapped under your control and the rest into their graveyard. Being able to mill an opponent to not only remove their best cards, but also steal their lands, is an awesome ability
This is also true if the TDFC is in a zone other than the stack or the battlefield
I don't like this at all on the draw
And if you got the Ghost Council out against control, it was like Deathpact Angel