Last night I tried out Nimble Mongoose. I was pretty disappointed. Went 1-2 overall. It just felt so underpowered in the meta, and Threshold is actually hard to turn on sometimes, and it's difficult to maintain when necessary. I did a 2/4 arrangement of Disrupting Shoal and Force of negation - that actually felt rather good.
Match 1: vs. Grixis Death Shadow 0-2
GDS is consistently my worst matchup, and this is where Mongoose really floundered. Between Shadow and Angler, my creatures are really lackluster. I know I need to keep Shadow off the table, but once it lands it's hard to get rid of. This feels like a matchup where I want to hold on to my burn spells and send them to the face at a critical moment, but I was just never in that position. I brought in EE, Collar, and Hazoret, but never really say them. Hazoret sat in my hand in my hand and I just never got the 4 mana to cast her.
Match 2: Izzet Phoenix 2-0
This match felt really easy. Echoing Truth and Vapor Snag really shine here. As does Cindervines just to peck away at their life as they spin their wheels.
Match 3: Mono-Red Phoenix 1-2
This was much harder than Izzet Phoenix. The goal is to exhaust their gas until they're top decking. I simply had bad draws. Had to Mull first game and last game, and was never drawing into any of my big creatures. Brought in Weather the Storm and Cindervines. Weather the Storm won me game 2.
My Goose experiment feels over. It just didn't help me out any more than Mandrills. Next time I'll be going back to Mandrills, which means I'm going to try out a counterspell base of 2 Stubborn Denial, 3 Disrupting Shoal, and 3 Force of Negation. If I ever get a set of Hexdrinkers I'll be interested to see how they play out.