She'd going to fit in Commander fine
Well cover the rules of Lorcana, how to get into collecting, and most importantly how to play the game with your local community of fans
Hakbal makes every Merfolk you control explore at the beginning of combat revealing the top of your library and either putting a land in your hand or a +1/+1 counter on that Merfolk

Here they are: Dual Lands Underground Sea: Grixis Control, U/B Deaths Shadow, Grixis Delver, Ad Nauseam Tendrils, Esper Stoneblade Volcanic Island: Grixis Control, Sneak and Show, Grixis Delver, Temur Delver, Ad Nauseam Tendrils Bayou: B/R Reanimator, Ad Nauseam Tendrils, Four-Color Loam, Turbo Depths Badlands: Grixis Control, B/R Reanimator, Four-Color Loam Tropical Island: Temur Delver, Infect Tundra: Miracles, U/W Stoneblade Scrubland: Four-Color Loam, Esper Stoneblade Savannah: Four-Color Loam Taiga: Lands, Four-Color Loam Other Cards City of Traitors: Sneak and Show, Eldrazi Stompy, Affinity, Mono-Red Prison The Tabernacle at Pendrell Vale: Lands, Four-Color Loam Intuition: Sneak and Show Null Rod: Miracles, Grixis Delver Lions Eye Diamond: Ad Nauseam Tendrils Mox Diamond: Lands, Four-Color Loam Drop of Honey: Lands Grim Monolith: Eldrazi Post Gilded Drake: Merfolk This list is eighteen cards long