Take the ordering of the bottom half of this list with a grain of salt, their ranks are all somewhat interchangeable

Biowaste Blob Bitter Ordeal Blade of Selves Blade of Shared Souls Blazing Firesinger Bloodforged Battle-Axe Bloodthirsty Adversary Blue Mage's Cane Blue Ribbon Blue Sun's Twilight Body Double Bonus Round Brain Freeze Bramble Sovereign Brass Knuckles Breeches, the Blastmaker Brenard, Ginger Sculptor Briarblade Adept Brigid's Command Broodbirth Viper Brudiclad, Telchor Engineer Burn Trail Bushy Bodyguard Bygone Marvels Cabaretti Confluence Cackling Counterpart Cadric, Soul Kindler Calamity, Galloping Inferno Calix, Guided by Fate Call of the Nightwing Caller of the Pack Caller of the Untamed Callidus Assassin Campus Composer Capricious Hellraiser Caretaker's Talent Case of the Shifting Visage Caught in a Parallel Universe Cemetery Puca Cephalid Facetaker Chain Lightning Chain Stasis Chain of Acid Chain of Plasma Chain of Silence Chain of Smog Chain of Vapor Chameleon, Master of Disguise Champion of Wits Chancellor of Tales Chandra's Regulator Chandra, Flameshaper Chandra, Hope's Beacon Chandra, Pyromaster Chandra, the Firebrand Changing Loyalty Chatterstorm Cheerful Osteomancer Chef's Kiss Choreographed Sparks Chrome Dome City of Death Clever Impersonator Clever Lumimancer Clone Clone Legion Cloven Casting Coastline Marauders Cogwork Assembler Coiling Rebirth Colorstorm Stallion Complete the Circuit

Then, with your creatures safely in play, they all gain trample, preventing your opponents from simply blocking them with a small 1/1 creature
It's time to get creative
It can also retrieve Forests, and puts your land into play untapped, but its well below any other entry being discussed in this post when it comes to efficiency a critical metric when measuring mana ramp
Youll be juggling triggers, negotiating with opponents, and sometimes losing more life than youd like