On mobile, thumb-friendly menus and single-hand navigation prove crucial in longer sessions
That's just one small application that I can think of right now, but there are bound to be a lot of broken applications of this card in practice

Commander Leinore, Autumn Sovereign Creature 46 Giver of Runes Mother of Runes Serra Ascendant Fyndhorn Elves Avacyns Pilgrim Speaker of the Heavens Mikaeus, the Lunarch Haywire Mite Birds of Paradise Sanctifier en-Vec Sungold Sentinel Scavenging Ooze Outland Liberator Bounty Agent Collector Ouphe Ornithopter of Paradise Luminarch Aspirant Wall of Mourning Katilda, Dawnheart Prime Gyre Sage Sakura-Tribe Elder Leafkin Druid Intrepid Adversary Orzhov Advokist Frontline Medic Kinjallis Sunwing White Plume Adventurer Aven Mindcensor Champion of Lambholt Heronblade Elite Bastion Protector Selvala, Explorer Returned King Darien XLVIII Mirror Entity Mentor of the Meek Eternal Witness Garruks Harbinger Master of Ceremonies Bramble Sovereign Slippery Bogbonder Odric, Master Tactician Shalai, Voice of Plenty Seasoned Dungeoneer Sigarda, Herons Grace Thunderfoot Baloth Instant 6 Heliods Intervention Swords to Plowshares Flawless Maneuver Grand Crescendo Eladamris Call Force of Vigor Sorcery 2 Artifact 6 Enchantment 4 Land 35 Canopy Vista Thriving Grove Vivid Grove Evolving Wilds Thriving Heath Krosan Verge Path of Ancestry Fortified Village Vivid Meadow Command Tower Temple of Plenty Sunpetal Grove Hickory Woodlot Windbrisk Heights Sungrass Prairie Ash Barrens Exotic Orchard Yavimaya, Cradle of Growth 8 Plains 7 Forest Synergies & Power Plays You may have noticed that Katilda, Dawnheart Prime and Selvala, Explorer Returned both make appearances in the deck despite being rejected commanders during my deckbuilding process

Harbinger of the Seas Harbinger of the Seas is the newest trend in nonbasic hate, combining the will of the merfolk to turn enemy lands into islands, and the islandwalk effects granted by cards like Lord of Atlantis
The way this card handles countering spells in red is precisely how you would expect it to- by allowing the controller of the countered spell to cast a random spell instead
That Pokmon pack you bought from Walmart could be hiding a holy grail