Boast Mentor Raid

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Boast, Mentor, Raid, plus a few Training cards.
This initial deck idea is pretty weak to base upon. It needs extra combats, but also needs extra mana for those combats, so I did an unusual thing (for me) and simply dumped some Time Walks in there. I usually avoid Time Walks, but this deck is pretty weak, and likely takes pretty fast turns, so I think it's probably OK.
 
Mana Acceleration (14): General (1): Spells (10): Sideboard (Omitted/Cut card ideas):
1 Alloy Myr 1 Yore-Tiller Nephilim 1 Alrund's Epiphany 1 Mardu Hordechief
1 Burnished Hart   1 Beacon of Tomorrows 1 Axgard Braggart
1 Charmed Pendant Creatures (39): 1 Capture of Jingzhou 1 Hagi Mob
1 Foreboding Statue // Forsaken Thresher 1 Aurelia, Exemplar of Justice 1 Nexus of Fate 1 Duskwielder
1 Millikin 1 Felisa, Fang of Silverquill 1 Part the Waterveil 1 Boros Challenger
1 Opaline Unicorn 1 Marauding Looter 1 Temporal Mastery 1 Hammer Dropper
1 Ornithopter of Paradise 1 Medomai the Ageless 1 Temporal Manipulation 1 Arni Brokenbrow
1 Scuttlemutt 1 Protean Raider 1 Time Stretch 1 Barging Sergeant
1 Solemn Simulacrum 1 Tajic, Legion's Edge 1 Time Warp 1 Fearless Pup
1 Unstable Obelisk 1 Truefire Captain 1 Walk the Aeons 1 Frenzied Raider
1 Deranged Assistant 1 Bloodsoaked Champion   1 Wojek Bodyguard
1 Birgi, God of Storytelling // Harnfel, Horn of Bounty 1 Draugr Recruiter   1 Blade Instructor
1 Knight of the White Orchid 1 Eradicator Valkyrie   1 Sunhome Stalwart
1 Kor Cartographer 1 Ruin Raider   1 Bellowing Saddlebrute
  1 Varragoth, Bloodsky Sire   1 Deadeye Tormentor
Lands (36): 1 Deadeye Rig-Hauler   1 Mardu Skullhunter
1 Underground Sea 1 Lighthouse Chronologist   1 Rigging Runner
1 Badlands 1 Shipwreck Looter   1 Swaggering Corsair
1 Tundra 1 Siren Reaver   1 War-Name Aspirant
1 Scrubland 1 Storm Fleet Aerialist   1 Raiders' Wake
1 Volcanic Island 1 Storm Fleet Spy   1 Heartless Pillage
1 Plateau 1 Timestream Navigator   1 Admiral's Order
1 Watery Grave 1 Dragonkin Berserker   1 Navigator's Ruin
1 Blood Crypt 1 Fearless Liberator   1 Arrow Storm
1 Hallowed Fountain 1 Goblin Banneret   1 Firecannon Blast
1 Godless Shrine 1 Legion Warboss   1 Howl of the Horde
1 Steam Vents 1 Mardu Heart-Piercer   1 Repeating Barrage
1 Sacred Foundry 1 Mardu Warshrieker    
1 Crumbling Necropolis 1 Storm Fleet Arsonist    
1 Arcane Sanctum 1 Storm Fleet Pyromancer    
1 Nomad Outpost 1 Tuskeri Firewalker    
1 Mystic Monastery 1 Battershield Warrior    
1 Savai Triome 1 Goldmaw Champion    
1 Raugrin Triome 1 Gryff Rider    
1 Command Tower 1 Gryffwing Cavalry    
1 Path of Ancestry 1 Hopeful Initiate    
1 Reflecting Pool 1 Light of the Legion    
1 Spinerock Knoll 1 Parhelion Patrol    
1 Windbrisk Heights 1 Savior of Ollenbock    
3 Swamp 1 Timely Hordemate    
3 Island 1 Usher of the Fallen    
3 Mountain 1 Wingmate Roc    
3 Plains      
1 Sol Ring