The decklists for the new wave of Challenger Decks for 2019 are in and they do look fine! Overall, the value is pretty good and the decks are tight.

Creature (29)
4 Dauntless Bodyguard
4 Healer’s Hawk
4 Leonin Vanguard
4 Skymarcher Aspirant
4 Ajani’s Pridemate
4 Adanto Vanguard
4 Benalish Marshal
1 Hunted Witness
Instant (3)
3 Pride of Conquerors
Enchantment (7)
3 Conclave Tribunal
2 Legion’s Landing
2 History of Benalia
Land (21)
21 Plains
60 Cards
Sideboard (15)
1 Conclave Tribunal 3 Baffling End 3 Knight of Grace 2 Tocatli Honor Guard 2 Make a Stand 1 Remorseful Cleric

Creature (21)
4 Fanatical Firebrand
4 Ghitu Lavarunner
4 Runaway Steam-Kin
4 Viashino Pyromancer
4 Goblin Chainwhirler
1 Rekindling Phoenix
Sorcery (3)
2 Lava Coil
1 Banefire
Instant (12)
4 Shock
4 Lightning Strike
4 Wizard’s Lightning
Enchantment (2)
2 Experimental Frenzy
Land (22)
22 Mountain
60 Cards
Sideboard (15)
4 Fight with Fire 4 Lightning Mare 4 Diamond Mare 3 Fiery Cannonade

Planeswalker (1)
1 Vraska, Relic Seeker
Creature (27)
4 Merfolk Branchwalker
4 Llanowar Elves
4 Wildgrowth Walker
4 Seekers’ Squire
2 Jadelight Ranger
3 Ravenous Chupacabra
1 Plaguecrafter
2 District Guide
3 Golgari Findbroker
Sorcery (2)
2 Find // Finality
Instant (4)
4 Cast Down
Enchantment (3)
3 The Eldest Reborn
Land (23)
2 Woodland Cemetery
4 Golgari Guildgate
1 Overgrown Tomb
2 Memorial to Folly
8 Forest
6 Swamp
60 Cards
Sideboard (15)
4 Duress 2 Arguel’s Blood Fast 3 Golden Demise 2 Reclamation Sage 2 Kraul Harpooner 2 Murder

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

Source:
https://magic.wizards.com/en/articles/archive/feature/challenger-decks-2019-03-18