That list seems reasonable, I agree it would be better than Mengucci's.
I'm running a weird list myself. Apart from the endbringer, that could be 2nd Karn/kuldotha, 4th Coil or 3rd Ballista, it seems to be running well, apart from missing artifact count sometimes, warranting me 2 top8 in a row in the weekly LGS tournament:
This was my run yesterday, as best as I remember:
Round 1 - UW Delver
I'm paired with my former teammate. He played the Pro tour last month, being 1 game away from prize. Due to traffic, he is late but we managed to start the game with 30 minutes in the clock. He plays several decks, but lately he was running Elves, so that's what I think he is on.
G1- I win the die roll and keep a tomb + chalice + metalworker +caverns hand. I see I'm wrong as he plays stoneforge mystic on the second turn, fetching for a jitte. On T3 I cast TKS and take his jitte. He casts 2 snapcasters to block my TKS (I saw his hand with TKS, so I'm well aware not to attack even beffore he casts the second), he gets a tnn and stall for a few turns, until he gets a batterskull and equips it. I'm bashed to 1 life, but I managed to get a kuldotha online, so when he goes for the kill, I fetch for an emperion. With post base, I'm soon with over 20 mana, so when I draw a staff, I'm able to draw 5 cards a turn and go infinite.
SB OUT: 3 wurmcoils, TKS, Endbringer, Trinisphere, 1 chalice
SB IN: 1 Ratchet Bomb, All is Dust, 4 keys, Thorn
I try a T1 monolith that gets dazed. He ponders and go for the 3rd land, casting a tnn. I have a Karn, Scion so I draw for a few turns trying to find an answer. I don't have 3 artifacts in play to crack the inventor's fair, only monolith and a dynamo. I fail to find the find the answer and die to tnn equipped with jitte.
IN: 1 chalice
OUT: Thorn
I keep a slow hand with 2 glimmers, cavern, 2 metalworker, 2 keys, ballista.
I ramp to metalworker and attempt to cast the lodestone that gets forced. He plays delver and jitte, so I play caverns on construct, trade ballista . I have metalworker and 2 keys in play, 1 key in hand, so I get a total of 9 mana with my lands. I attack him a few times with metalworker as I have nothing to do with the mana. I topdeck a sundering titan that gets plowshared, but destroys his manabase he is slowed. He plays another delver, but I find an ugin to deal with it. Next turn I bolt him, taking Ugin to 11. He finds council and feels visibly relieved. I tpdeck another Ugin that ups and ults, not finding much, but enough to close the game.
1-0
Rd2 - UW Miracles Legends
This is a experienced player, we both know what the other is on. He tells me we are paired and we sit down for a smoke before playing.
I lose the die roll.
G1- I keep tomb + monolith+ chalice+ mw+ wurmcoil.
I cast chalice, that gets fow'ed. He ponders and I play metalworker, bringing wurmcoil next turn. He plowshares the wurmcoil, I get Citanul online, he councils it, so I get a ballista. I draw a staff and go infinite.
SB IN: 2 Ratchet Bomb, 1 Ulamog, 1 Karn Liberated, 4 Voltaic Key, 1 All is Dust
SB OUT: 3 wurmcoil, 1 Trinisphere, 1 staff, 2 spyglass (not sure if I should, he uses karakas as an engine)
He mulligans (he told me later he was looking for back to basics). I Mulligan to find a key + rock. He goes tundra go, I do nothing go. He plays plains and ponder. I vesuva his plains and go for key. a second vesuva copies his plains and go for monolith + chalice for 1. I start drawing and play cavern on construct and golem, so he can't do nothing to protect his manabase against Sundering Titan. I hit him once, then he finds an answer to the titan. a 10/10 ballista follows, closing the game.
2-0
Rd3 - Burn
I'm playing against the store's judge. He tells me he was going to play with MUD in that tournament, but he was short on lodestones. I tell him I'd lend him and explains a bit on how my list is different from Mengucci's before we start playing. I saw him playing earlier so I know he is on burn.
I win the die roll. Go for tomb + chalice. T2 I cast TKS taking Light up the Stage, and T$ wurmcoil. He concedes.
SIDE IN: 2 ratchet bombs, 1 sphere of Resistance, 1 Thron, 4 Keys
SIDE OUT: 2 Ugin, 1 Citanul Flute, 1 Sundering Titan, 1 Endbringer, 2 Staff, 1 Karn, Scion
I keep a slow hand to ramp to wurmcoil. het casts 2 monastery swiftspears and starts bashing. I play trinisphere that holds him 1 turn, but he gets to the 3rd land, killing metalworker before it can untap. When I'm at 8 life, he casts PoP.
SIDE IN: 1 Staff
SIDE OUT: Endbringer
I mulligan to 6 to a ridiculously good hand. I play tomb + chalice on 1. He land, passes. I play sphere of resistance, he pass. Since he didn't get the 2nd land, I play metalworker first. He goes 2nd land, passes. I play lodestone. He gets to the 3rd land eventually, but taking 6 damage a turn, he doesn't get to play a single spell.
3-0
I'm first on the standings so I ID the 4th round.