Like most Magic: The Gathering cards, the value of Banishing Light depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Theros Beyond Death)
It's nothing fancy, but it's a threat that has to be answered on many boardstates
vChance at The List
You can find great benefits from pairing them with cards like Attune with Aether, Decoction Module, or Winding Constrictor
Gallery and List of Meld Cards Bruna, the Fading Light + Gisela, the Broken Blade = Brisela, Voice of Nightmares Fang, Fearless l'Cie + Vanille, Cheerful l'Cie = Ragnarok, Divine Deliverance Graf Rats + Midnight Scavengers = Chittering Host Hanweir Battlements + Hanweir Garrison = Hanweir, the Writhing Township Mishra, Claimed by Gix + Phyrexian Dragon Engine = Mishra, Lost to Phyrexia Urza, Lord Protector + The Mightstone and Weakstone = Urza, Planeswalker Titania, Voice of Gaea + Argoth, Sanctum of Nature = Titania, Gaea Incarnate Best Meld Cards The original meld cards never really saw much play in their time in Standard, but Gisela, the Broken Blade saw some play on its own as a solid beater in midrange decks
The variance in ability between the colours to deal with creatures is negligible when compared to the variance across the colours in their capacity to combat spell casting