Sideboard Nov 2019: I removed 2 Pyroblast, Swirling Sandstorm, Circle of Protection:Blue, Oblivion Ring

Terminate is a good sideboard card for dealing with Guardian of the Guildpact. Key sideboard card against pestilence decks.

https://www.hipstersofthecoast.com/2018/07/sideboarding-with-pauper-boros/

I reworked the list I initially had for this to have a more defensive/interactive posture - Oblivion Rings especially but also Prismatic Strants (which can be used offensively as well). I also removed cenn's enlistment and 2 Firebolts. I reworked land to be less susceptible to artifact hate. Down to 2 Palace Sentinels because I have rarely been able to control the early game well enough to keep the Monarch for myself. Plus I hate getting 2 of them in the opening hand.

Should I cut Radiant Fountain more to make way for 1 Quicksand (can't be countered and can get rid of Delver).

Most run 4 prophetic prisms to help the early game mana, but I find I don't like having a bunch of them towards the end in long matchups. 3 seems to be enough.

primer specific to this Boros version:

https://www.reddit.com/r/Pauper/comments/7z878g/boros_monarch_primer/

older primer:  http://puremtgo.com/articles/pauper-people-kuldotha-boros-update-and-sideboarding-guide

video primer: https://www.youtube.com/watch?v=FX4K3MWeEQs&list=PLgMwVd-UWMPeYzvZu2twbHraH4Boe4Ol-&index=1

decklist for mathonical video primer: https://www.mtggoldfish.com/deck/925962#paper

If I'm expecting a Delver-heavy meta, then good idea to put a Circles of Protection: Blue in the sideboard.


Other potentially interesting cards:

Sanctum Gargoyle (!)

Swirling Sandstorm - SB
Aviary Mechanic - Doesn't fly, but very flexible on what returns to hand
Bestial Fury
Bond Beetle
Borderland Ranger? No - only 1 basic land in deck
Cartouche of Solidarity
Cloudchaser Kestrel - seems better SB than Cor Santifier - don't have to kick.
Conclave Phalanx (SB)
Coral Barrier - SB for blue match-ups
Custodi Squire - return stuff from graveyard
Deputy of Aquitals - has flash
Elsewhere Flask (would also want Rolling Thunder)
Emrakul's Hatcher
Galvanic Arc
Ghostly Flicker (especially if there's MnemonicW or IzzetC)
Hammerheim Deadeye - seems like great sideboard card
Impact Tremors
Inspiring Captain
Ironshell Beetle
Ivory Giant (very interesting card - but better with flicker effects)
Izzet Chonarch (Mnemonic wall alternative)
Kabira Crossroads - seems better for deck than radiant fountain.
Keldon Marauders - awesome fit for this deck!
Keldon Vandals
Knightly Valor - probably too expensive
Manic Vandal (3 cost to destroy artifact)
Man 'O War
Mardu Skullhunger (this would really surprise opponents!)
Mardu Warshrieker (I think this works!)
Maul Splicer (very expensive but 2 3/3 Golem tokens seems big payoff)
Mnemonic Wall
Mogg War Marshall
Mold Shambler - kill anything that is not a creature
Monk realist - cheap enchantment killer
Mulldrifter
Mycosynth Wellspring - only makes sense if many basic lands
Nest Invador
Noggle Bridgebreaker
Orzhof Euthanist (very good kill spell for 3 cost)
Pestermite (has flash)
Pit Keeper - good for longer games to recur creatures
Pith Driller
Ponyback Brigade - expensive way to create 3 tokens
Prosperous Pirates
Ravenous Rats - costs only 2 - wow this is great!
Sage of Epityr - reorder top 4 for only cost of 1
Sailor of Means
Sandsteppe Outcast - keep generating 1/1 flyers
Seller of Songbirds - keep generating 1/1 flyers
Sensor splicer - expensive way to generate a 3/3 Golem
Shrieking Drake - fits deck well
Silver Drake - fits deck well, boost to creature power
Sparkmage Apprentice
Stingscourger
Strands of Undeath
Subterranean Shambler (wow this is a non-flyer mini board wipe!)
Village Bellringer - flash so can defend a big attack successfully
Whirlpool rider
Whitemane Lion has flash, AND goes great with deck
Wispmare - Evoke makes this interesting
Workfang Drake - complicated way of reusing an ETB effect