Devouring Swarm - Control the Board, proc BOAR and get multiple copies of BOAR or other useful minions.
Armor Vendor - Adds survivability and something to play early.
Carrion Studies - Reduce the cost of a BOAR to easier combo it with Northshire Farmer or Dire Frenzy. Sometimes discover another BOAR.
Elwynn Boar - The BOAR.
Tracking - Find the right card to play next. Or a BOAR.
Trueaim Crescent - Something to play early and control the board, can proc BOAR.
Bola Shot - Control the early board, or proc some BOARs when you are about to get the SWORD.
Scavengers Ingenuity - Get some BOAR.
Selective Breeder - Get some BOAR.
SI:7 Skulker - Something to play early and can make it easier to play BOAR + Farmer/Frenzy combo.
Northshire Farmer - Put some buffed BOARs in the deck.
Shan'do Wildclaw - Transform into a copy of a buffed BOAR. Or (rarely) buff the BOARs in your deck.
Dire Frenzy - Put some buffed BOARs in the deck.
Warsong Wrangler - Get some buffed BOAR.
Cornelius Roame - You will run out of cards. This can help. (Maybe other card draw is better?)
Guardian Animals - Recruit some buffed BOARs, trade them in and get the SWORD. (Sucks when drawn early, but this can absolutely be the key card to get the SWORD)
Low winrate, but it is still possible. Sometimes you can win just because of your giant BOARs.