Originally Posted by
paradigm72
I second TMWAP's suggestion of Grim Lavamancer and True-Name Nemesis being strong inclusions. To me, they're worth dropping Rough // Tumble which would otherwise be great. In its place, I love playing a 1x Pyrokinesis in the board as my sweeper - that card has bailed me out of so many situations. Being free is excellent in tempo matchups like Delver and D+T, where you don't have extra mana to spend, and you are often boarding Force of Will out anyway so giving up a card is acceptable. It's pretty common for it to be an even 2-for-2 trade, but a huge tempo gain because you spent zero mana and they spent at least two.
I think I've finally turned a corner on understanding the Delver mirror over the past few months. Previously I struggled a lot with it, but lately I'm hitting 65% win rate against a mix of Grixis and BUG, mostly by being more patient and trying to one-for-one them while chipping in damage. I'm starting to play this matchup the opposite of the way I play Miracles (where I blitz all out), and instead try to trade resources carefully and not go down cards or get caught by Daze. It seems like our basic lands and extra removal allow us to stay in the game for a surprisingly long time. Goyf/Angler are obviously the big risk to that plan, but even when they land we have 8+ threats that can go over them and race. Price of Progress is usually good for 4 damage even against Wasteland/Daze tricks, and that can be enough to finish them off.