On the most basic level, on your turn, you draw a new card, play one land card if you have one, and then cast spell cards from your hand of cards
Of course, once you got an elemental in play permanently, you could continue to flicker, clone, and otherwise recur the ETB through all kinds of means
Abian, Luvion Usurper (playtest) Abzan Ascendancy Abzan Monument Afterlife Afterlife Insurance Akki Ember-Keeper Alharu, Solemn Ritualist Anafenza, Unyielding Lineage Architect of Restoration Avacyn's Collar Avatar Kuruk Baboon Spirit Baku Altar Beckon Apparition Bishop of Wings Blessed Defiance Brine Comber Brinebound Gift Broken Visage Ceaseless Conflict Chishiro, the Shattered Blade Clarion Spirit Cleaver Blow (playtest) Concord with the Kami Court of Grace Custodi Soulbinders Dauntless Cathar Daxos the Returned Descendant of Storms Donal, Herald of Wings Doomed Traveler Dorothea's Retribution Dripping-Tongue Zubera Drogskol Cavalry Dusyut Earthcarver Elgaud Inquisitor Emissary of the Sleepless Ethereal Absolution Ethereal Investigator Evil Boros Charm (playtest) Field of Souls Foggy Swamp Spirit Keeper Forbidden Orchard Fortress Kin-Guard Funeral Pyre Gallows at Willow Hill Garrison Excavator Geist Snatch Ghastly Mimicry Ghostly Dancers Gift of Wrath Go-Shintai of Shared Purpose Gods' Eye, Gate to the Reikai Goro-Goro and Satoru Goro-Goro, Disciple of Ryusei Great Arashin City Group Project Hallowed Haunting Hanged Executioner Haunted Dead Haunted Library Haunting Imitation Hei Bai, Forest Guardian Hofri Ghostforge Honden of Life's Web Illuminate History Illustrious Historian Imperious Oligarch Indebted Spirit Inspirited Vanguard Kaya the Inexorable Kaya's Guile
Only an untapped creature can block
Scheming Symmetry plays a role akin to that of Imperial Seal
