Oh, that is nice. Responding to a trick with a removal spell can be devastating :) And yeah, the article is amazing. I love the Remand example as well.
Ah, that's good synergy, but it isn't a 2-for-1. As Mike Flores defines it here: "a two-for-one is any card advantage activity that trades one card for two cards." (Not that he's the authority on two-for-ones, but he uses a commonly accepted definition and explains it very well with lots of...
I run Dragonlord Atarka at the moment, which is cheaper, more splashable, and a huge, evasive threat, and has immediate impact. Wonder if I should swap, because those aren't necessarily always a positive.
Or, "The first time you activate an ability each turn, it costs up to {2} less to activate."
Stick it on a 1/1 for {W} with "{2}{W}, {T}: Tap target creature." and you've got yourself a nice little tapper.
The "up to" wording is stolen from Training Grounds.
Alternatively you could go with...
Virtus's Maneuver is a clean two for one, but you still have to work for it to make the most of it. I quite like it in theory, as it's an edict that still has some value against token decks.
So, are you casting DD for X = 2 then? You're never casting it for X = 4, I presume, because I don't see how you're coming back from that huge card disadvantage.
I like it, but there is tension with black'slove for discarding your opponent's cards. "Covetousness" would be a good alternative name for this mechanic.
Interestingly, it does put up good results, but slower decks are still very viable. The last few winning decks were UBw Artifacts, Naya Beats, R/G Wildfire Aggro, B/W Control, Esper Control, and Grixis Spells.
I cut all one mana accelerants in green, all two mana mana rocks in the artifact section, and all four mana wraths. The two mana ramp cards in green are played, the three mana mana rocks are played, and the five mana wraths are effective as well. I haven't looked back ever since I found out...