MTG Arena Beta | Five Color Planeswalkers DeckTech & Gameplay [Why?]

Decklist: 1 Karn, Scion of Urza (DAR) 1 1 Nissa, Steward of Elements (AKH) 204 1 Island (RIX) 193 1 Forest (RIX) 196 1 Ajani Unyielding (AER) 127 1 Plains (RIX) 192 1 Nicol Bolas, God-Pharaoh (HOU) 140 1 Mountain (RIX) 195 1 Vraska, Relic Seeker (XLN) 232 1 Angrath, the Flame-Chained (RIX) 152 1 Teferi, Hero of Dominaria (DAR) 207 1 Dovin Baan (KLD) 179 1 Nissa, Vital Force (KLD) 163 1 Chandra, Torch of Defiance (KLD) 110 1 Liliana, Death’s Majesty (AKH) 97 1 Jace, Cunning Castaway (XLN) 60 3 Seal Away (DAR) 31 3 Cast Out (AKH) 8 3 Fumigate (KLD) 15 2 Vraska’s Contempt (XLN) 129 1 The Eldest Reborn (DAR) 90 4 Llanowar Elves (DAR) 168 4 Gift of Paradise (AKH) 167 1 Oath of Teferi (DAR) 200 1 Nicol Bolas, the Ravager (M19) 218 2 Glacial Fortress (XLN) 255 2 Irrigated Farmland (AKH) 245 2 Isolated Chapel (DAR) 241 2 Drowned Catacomb (XLN) 253 2 Fetid Pools (AKH) 243 2 Sulfur Falls (DAR) 247 1 Canyon Slough