Each Challenger Deck 2019 - 60 card main deck with a 15 card sideboard
Creature (13)
4 Goblin Electromancer
4 Crackling Drake
2 Murmuring Mystic
1 Arclight Phoenix
2 Niv-Mizzet, Parun
Sorcery (9)
4 Chart a Course
4 Lava Coil
1 Beacon Bolt
Instant (15)
4 Opt
4 Radical Idea
4 Shock
2 Dive Down
1 Blink of an Eye
Enchantment (1)
1 The Mirari Conjecture
Land (22)
3 Sulfur Falls
4 Izzet Guildgate
8 Island
7 Mountain
60 Cards
Sideboard (15)
1 The Mirari Conjecture 1 Beacon Bolt 3 Negate 3 Entrancing Melody 3 Fiery Cannonade 2 Shivan Fire 2 Disdainful Stroke