With the font in particular, it actually makes
Blightsteel Colossus a lot better IMO, even without haste. If someone does anything except
exile it, it goes back to the
library where I just use the font again to bring it right back down. If someone does
exile, hopefully I have a sac outlet or my own removal I can kill it with in response, to get it back into
library to use the font ASAP. It essentially becomes a way to get my opponents to "waste" their removal. I feel like it's also a political tool to make deals with someone who is a threat to me, agree not to swing the Colossus at them next turn IF...
While
Darksteel Forge is a fantastic value piece, I was trying to find things are huge threats immediately that need to be answered or I win, a la Colossus.
Portal to Phyrexia is probably a good bet in most games there should be good things to grab from graveyards.