@ the new rogue merfolk, we already had prickly boggart, which is essentially the same thing. The only playable creatures that could block are revoker/bob, and I'd gladly trade a boggart for either of those if an opponent wants to block!
The new rogue is strictly better than any 1 drop rogue we already have. Unblocked is the best possible evasion, so he's better than Merfolk Spy. He's blue, so he pitches to FoW which makes him better than Prickly Boggart and the like.
He might be better than Stalker if your environment is removal-light.
I tried a BG shell, so I could run decays. The U was nice for countering blowout cards (deluge), but misstep/thoughtseize/rogues with blackguard pump took care of the threats in hand already, missteps handled plow/bolt, and the manabase was MUCH smoother without killing me slowly. I didn't have access to invisible stalker, but I used Silhana Ledgewalkers which were typically just as good. Vintage lacks for flyers at the moment, so it was essentially the same card - and decay/liliana of the veil/dismember could clear the skies if needed. Good equips were very tempting with fliers (blackguard, bitterblossom) and unblockables (Ledgewalker), but in the end, I cut them. I also cut the bitterblossoms since the deck is stuffed with critters and a token maker was really unnecessary I found.
Here's what I had made so far:
4 [AVR] Cavern of Souls
1 Forest (4a)
4 Verdant Catacombs
1 Strip Mine
4 Oona's Blackguard
4 Earwig Squad
4 Frogtosser Banneret
4 Stinkdrinker Bandit
3 Silhana Ledgewalker
4 [RTR] Abrupt Decay
2 [ISD] Liliana of the Veil
1 [ARB] Maelstrom Pulse
1 Mox Emerald
1 Mox Jet
1 Black Lotus
3 Null Rod
3 [NPH] Mental Misstep
SB: 1 [ARB] Maelstrom Pulse
SB: 1 Null Rod
SB: 4 [M11] Leyline of the Void
SB: 1 Emissary of Despair
SB: 1 Pithing Needle
SB: 1 Perish
SB: 2 Dystopia
SB: 4 [DKA] Grafdigger's Cage
Some card choices...
No demonic or vampiric. I had them both in, but really, what is this deck looking for? Tutoring for earwig means you aren't dropping a critter with that mana or casting disruption. You have 4 decay and a pulse to remove problems G1, and 2 liliana to handle tinkerbots and other troublesome critters, so you will draw answers instead of tutoring for them. The only target there really is would be null rod, and clogging the deck with 2 tutors for a virtual 5 null rods (which isn't THAT great vs many decks anyway) wasn't worth it.
Misstep, but no duress. Seize grabs critters to clear a path and you play all your mana at sorcery speed anyway (or are holding BG for decay), so missteps got the nod. They handle any great 1cc when on the draw or when the opponent luck-sack topdecks it anyway. Key, ancestral, plow, bolt, delver are the cards this deck hates to see anyway. You're often tapped out each turn anyway, so you need a free answer spell.
Stinkdrinker Bandit. Holy nutsack, why is nobody talking about this guy??? With flying critters, unblockable critters, hasty critters, and gigantic critters, a +2/+1 for EVERYTHING unblocked is stupid good. Ive had turns where my opponent attacked me (counting the damage I had on board), then dropped this guy in of a cavern (not prowl) and added 6-8 to my attack FTW! Even off a turn 1 frogtosser, this guy prowls in really cheaply and is an unholy strength for your whole deck. Drop 2, and you can win fast with only a couple evasive guys. A single ledgewalker beats like a juggernaut when prowling 2 of these guys in.
No nemesis/shardless agent Obviously, I need blue for these guys - but one reason I cut down to BG was because I didn't see their need so much. With stinkdrinkers pumping silhanas and fliers, they ALL became 3/x attackers. With removal (esp liliana), there wasn't so much concern over immortal blockers. Shardless was terrible flipping into a misstep/decay (with no target)/frogtosser/duplicate null rod/moxen with an active rod, and is an overcosted 2/2 with no evasion anyway.
No card draw. I like Edric, but there's just so much redundancy here that you rarely need refills (esp since caverns makes your stuff resolve). I would consider necropotence as it is an awesome refiller and can then be decayed to get back your draw step. I also considered jitte or SoFI if I did want to add more draw/utility (but rod hurts that). Yawg will is too slow in this deck with no rituals.
Of all of these, I think the best add is necropotence (which may necessitate Vamp/DT again), but what to cut?
This deck isn't too bad against shops, despite the lack of direct artifact hate. It is fast and frogtossers are antispheres. Caverns ignore chalice. You can often race their clock with stinkdrinkers, and a 3 mana 5/3 is really good vs golems. Emissary in the board is an extra fast clock vs shops, and the 3 (4th in board) rod smacks metalworker builds (as well as really hurts storm and bomberman) You get a bit more punch vs oath with decay over main cages, and earwig is also brutal vs oath, but you get to clear blockers with decay which grafdigger can't help.
Nice list... It's like suicide black with rogues now. Blue less is definitely worth investigating because Abrupt Decay and natures claim are very good. But right now I'm predisposed to UB because ARecall and FoW and TNN and Thada Adel are just so good for me in testing.