You can only use 1 "Endless Engine Argyro System" effect per turn, and only once that turn
If you need a 4-drop you can probably do worse, but how often are you desperate for a 4 drop in Limited

Acidic Soil Avenger of Zendikar Bioengineered Future Blackblade Reforged Blanket of Night Bountiful Harvest Branch of Boseiju Brass's Bounty Bumi, Eclectic Earthbender Cleansing Coastline Marauders Crystalline Armor Culmination of Studies Dingus Egg Drain Power Drown in Filth Dune Chanter Dune-Brood Nephilim Earth Surge Elsewhere Flask Eluge, the Shoreless Sea Emergent Sequence Equipoise Eumidian Wastewaker Every Dream a Nightmare From the Ashes Garruk, Primal Hunter Gerrard's Verdict Gerrymandering Great Divide Guide Hazezon Tamar Herald of Leshrac Joyous Respite Knight of the Reliquary Krenko's Buzzcrusher Land Equilibrium Lightstall Inquisitor Lluwen, Imperfect Naturalist Mana Flare Mana Seism March from Velis Vel Michelangelo, On the Scene Multani, Yavimaya's Avatar Nahiri's Lithoforming Naya Obsidian Charmaw Omo, Queen of Vesuva Orcish Squatters Avatar Ore-Scale Guardian Patient Rebuilding Phabine, Boss's Confidant Power Surge Pygmy Hippo Rain of Filth Rampaging Brontodon Rumbleweed Shimmer Stench of Evil Strata Scythe Tazeem Tectonic Reformation Terraformer Tsabo's Web Urborg, Tomb of Yawgmoth Vision Charm Walker of the Wastes Wave of Vitriol Worm Harvest Yavimaya, Cradle of Growth Yuma, Proud Protector Zanarkand, Ancient Metropolis Zanarkand, Ancient Metropolis

When the owner pulled it out I couldn't believe how nice it was, I light tested it and louped it before laying out the money on the countertop
Miriam Like I was saying in the strategy, some Ralts are likely going to get KOed, and we need to have a way to get them back