The first is very easy to pull off
So, with all of that said, picking a land out of a pack to add to your deck is a real commitment
Keep Adeline protected, and it can quickly overwhelm your opponent with minimal work.
Its a strong addition for at least Cube and casual EDH, and at least Standard sideboard play

Control Nymris, Oona's Trickster | Illustration by Johannes Voss Commander (1) Battle (1) Creature (26) Academy Loremaster Snapcaster Mage Quickling Blacklance Paragon Cunning Nightbonder Spectral Adversary Wavebreak Hippocamp Opposition Agent Slitherwisp Vendilion Clique Tishana's Tidebinder Brazen Borrower Nimble Obstructionist Ebondeath, Dracolich Crafty Cutpurse Notion Thief Ulamog's Nullifier Voracious Greatshark Teferi, Mage of Zhalfir Thryx, the Sudden Storm Dream Eater Lochmere Serpent Callidus Assassin Torrential Gearhulk Hullbreaker Horror Elder Deep-Fiend Instant (25) March of Swirling Mist Mystical Tutor Brainstorm Consider Dark Ritual Drown in the Loch Run Away Together Cyclonic Rift Mission Briefing Narset's Reversal Counterspell Dimir Charm Go for the Throat Tainted Indulgence Filter Out Dihada's Ploy Silundi Vision Ancient Excavation Deadly Rollick Rewind Mystical Teachings Aetherspouts Mystic Confluence Nexus of Fate Dig Through Time Artifact (9) Sol Ring Scroll Rack Arcane Signet Dimir Signet Talisman of Dominance Sapphire Medallion Thaumatic Compass Fellwar Stone Commander's Sphere Land (37) Exotic Orchard Command Tower Myriad Landscape Evolving Wilds Reliquary Tower Temple of the False God Otawara, Soaring City Castle Vantress Shipwreck Marsh Jwar Isle Refuge Clearwater Pathway Darkwater Catacombs Dimir Aqueduct Temple of Deceit Sunken Hollow Restless Reef Creeping Tar Pit Sunken Ruins Choked Estuary Swamp x8 Island x10 Control is a reactive macro-archetype that wants to operate at instant speed and respond to what your opponents are doing

Still, it's a highly thematic and aesthetically appropriate ability for the deck