Thassa, Deep-Dwelling Creatures with enters the battlefield abilities are among the best in the game because of the immediate impact they have on the board
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This card, Blanket of Night, would benefit a mono-black deck that aims to take advantage of the Swamp type for various synergies such as triggering landfall abilities or benefiting from cards that care about Swamps
The average casual player isnt thinking that deep on math, other than how many lands they should run at minimum (always too few) and how many card draw spells or board wipes to run (again, usually too few)
Blinding Angel from way back in Nemesis has a combat damage trigger that can stop someone having a combat phase entirely
It doesnt feel like that here, as Magic has carefully crafted entirely new mechanics to translate Final Fantasys vibe