Each time a new set approaches, the writers of magicthegathering.com get to do a couple weeks of previews, showing off the new cards before you can see them anywhere else
We are running 6 counters and this duo for a total of 8 ways to say "No." The Whelk is amazing here as it can flash out and counter a spell
You do have to target it though which means that through some means (say asking one of the players in that game who would benefit from having the card destroyed) you have to figure out what the card is
We can also use Rabble Rousing to essentially double our tokens whenever we move to combat
I think an Egon / Throne of Death plan will make it easier to keep Egon around, but there are easier ways to self-mill in Black without jumping through all those hoops
Obviously, if you have information, thats a different story, but if all you know is that you are playing Legacy, Brainstorm is typically the move