For example, you may only play a land from exile this way during your main phase while the stack is empty, and only if you haven't played a land yet this turn
The following rulings focus on the phasing keyword While a permanent is phased out, it's treated as though it doesn't exist
Elsha of the Infinite Elsha of the Infinite has a really neat design
The 'Good' version features only a small increase in the number of rare cards so that you can get started making tweaks right away without needing to buy any expensive cards

Creature Legendary Stella Lee, Wild Card Eris, Roar of the Storm Talrand, Sky Summoner Octavia, Living Thesis Niv-Mizzet, Parun Kaza, Roil Chaser Veyran, Voice of Duality Non-legendary Archmage Emeritus Haughty Djinn Thunderclap Drake Crackling Spellslinger Bloodthirsty Adversary Murmuring Mystic Pteramander Storm-Kiln Artist Young Pyromancer Electrostatic Field Guttersnipe Goblin Electromancer Third Path Iconoclast Sorcery Baral's Expertise Tezzeret's Gambit Lock and Load Finale of Revelation Curse of the Swine Mizzix's Mastery Pyretic Charge Elemental Eruption Rousing Refrain Finale of Promise Epic Experiment Treasure Cruise Preordain Ponder Deep Analysis Vandalblast Serum Visions Faithless Looting Volcanic Torrent Windfall Expressive Iteration Enchantment Arcane Bombardment Shark Typhoon Propaganda Instant Dig Through Time Chaos Warp Galvanic Iteration Radical Idea Opt Think Twice Arcane Denial Pongify Big Score Land Exotic Orchard Shivan Reef Sulfur Falls Frostboil Snarl Temple of Epiphany Cascade Bluffs Ferrous Lake Command Tower Temple of the False God Reliquary Tower Izzet Boilerworks 14 Island 13 Mountain Other Forger's Foundry Token Bird Illusion / Elemental Ape / Shark Drake / Soldier Boar / Drake Elemental / Soldier Dragon Elemental / Bird Illusion Dragon Elemental / Treasure Bounty card: Rissa "Blades" Lee Bounty card: Sleepy Sovka Bounty card: Miron Tillas Jr

I acquired it in an elaborate trade and my plan is to hold onto it indefinitely