I think initiative is a great addition to venture and shows the mechanic is can go in the right direction in terms of power level and player interaction

Mystic Intellect Commander (1) 1 Sevinne, the Chronoclasm Planeswalker (1) 1 Ral Zarek Creature (19) 1 Backdraft Hellkite 1 Burnished Hart 1 Clever Impersonator 1 Cliffside Rescuer 1 Crackling Drake 1 Dockside Extortionist 1 Elsha of the Infinite 1 Gerrard, Weatherlight Hero 1 Guttersnipe 1 Pramikon, Sky Rampart 1 Pristine Angel 1 Pristine Skywise 1 River Kelpie 1 Scaretiller 1 Sun Titan 1 Talrand, Sky Summoner 1 Thalia's Geistcaller 1 Wall of Stolen Identity 1 Zetalpa, Primal Dawn Sorcery (13) 1 Deep Analysis 1 Devil's Play 1 Divine Reckoning 1 Dusk // Dawn 1 Faithless Looting 1 Ignite the Future 1 Increasing Devotion 1 Mass Diminish 1 Mystic Retrieval 1 Rolling Temblor 1 Runic Repetition 1 Sevinne's Reclamation 1 Storm Herd Instant (15) 1 Chemister's Insight 1 Desperate Ravings 1 Fact or Fiction 1 Farm // Market 1 Fervent Denial 1 Increasing Vengeance 1 Leadership Vacuum 1 Magmaquake 1 Mandate of Peace 1 Oona's Grace 1 Prismatic Strands 1 Purify the Grave 1 Ray of Distortion 1 Refuse // Cooperate 1 Think Twice Artifact (7) 1 Armillary Sphere 1 Azorius Locket 1 Bloodthirsty Blade 1 Commander's Sphere 1 Empowered Autogenerator 1 Izzet Locket 1 Sol Ring Enchantment (4) 1 Burning Vengeance 1 Ghostly Prison 1 Jace's Sanctum 1 Secrets of the Dead Land (40) 9 Plains 8 Island 4 Mountain 1 Ash Barrens 1 Azorius Chancery 1 Boros Garrison 1 Boros Guildgate 1 Command Tower 1 Evolving Wilds 1 Exotic Orchard 1 Highland Lake 1 Izzet Boilerworks 1 Izzet Guildgate 1 Myriad Landscape 1 Mystic Monastery 1 Prairie Stream 1 Stone Quarry 1 Swiftwater Cliffs 1 Temple of the False God 1 Terramorphic Expanse 1 Tranquil Cove 1 Wind-Scarred Crag *********** The new cards in the deck are: Backdraft Hellkite Bloodthirsty Blade Cliffside Rescuer Dockside Extortionist Elsha of the Infinite Empowered Autogenerator Gerrard, Weatherlight Hero Ignite the Future Leadership Vacuum Mandate of Peace Mass Diminish Pramikon, Sky Rampart Scaretiller Sevinne, the Chronoclasm Sevinne's Reclamation Thalia's Geistcaller Wall of Stolen Identity .

It could even work for control decks that can use the flip side, Caetus, Sea Tyrant of Segovia to help keep mana open for counterspells
Deadpool, Trading Card Most players won't pay 3 life to keep Deadpool, Trading Card around, but pay to get rid of the effect is a way to cut losses
You can tap a bunch of mana rocks then attack with something meaningless like a Thopter to deal a bunch of damage to something and dig through your deck to find your finishers
Sneak around your opponents defenses and strike with deadly precision