It hard stops any kind of spell and turns it into mana for your next main phase
Control the table with a deep charm/command toolbox like Bant Charm, Jeskai Charm, Dromokas Command, Prismari Command, then close through overwhelming value

Abundance Agent's Toolkit Alhammarret's Archive Alms Collector Archmage Ascension Artist's Talent Asmodeus the Archfiend Bard, King of Dale Blood Scrivener Case of the Pilfered Proof Dakmor Salvage Dark Dabbling Darkblast Enduring Renewal Eruth, Tormented Prophet Family's Favor Fasting First-Sphere Gargantua Fisher's Talent Flotsam // Jetsam Forbidden Crypt Golgari Brownscale Golgari Grave-Troll Golgari Thug Grave-Shell Scarab Greater Mossdog Heroic Sacrifice High Score Hullbreacher Immortal Coil Island Sanctuary Izzet Generatorium Jace, Wielder of Mysteries Jaya Ballard Laboratory Maniac Lashknife Barrier Leader, Super-Genius Lich Life from the Loam Living Conundrum Mangara's Tome Meat Locker // Drowned Diner Moldervine Cloak Necrodominance Necroplasm Nemata, Primeval Warden Nightmare Void Notion Thief Obstinate Familiar Ormos, Archive Keeper Out of the Tombs Ozolith, the Shattered Spire Parallel Thoughts Peregrin Took Personal Decoy (playtest) Phial of Galadriel Plagiarize Pursuit of Knowledge Quantum Riddler Ral's Vanguard (playtest) Retriever Phoenix Rigo, Streetwise Mentor Rime Chill Sages of the Anima Scrapwork Mutt Scrapwork Rager Shambling Shell Sharae of Numbing Depths Shenanigans

Being instant also helps to make Dart super tricksy and the most option dense red card on offer
if you dont mind spoilers, check out our guide to what happens when you win, right here) setting the stage for a big party near the Great Illuminary
It's a great way to pick up and play Magic and Commander and Captain N'ghathrod presents a wonderful new way to play with one of the game's oldest and coolest creature types