Opening Twilight Masquerade Premium Checklane Blister [Horsea] returns about $4.47 in card value against its $25.00 price — roughly $0.18 back per dollar spent. On current prices, you lose money on average by opening it.
See every card and pull rate in Twilight Masquerade
How expected value is calculated — card value only, from published pull rates and daily market prices.
Twilight Masquerade Premium Checklane Blister [Horsea] on TCGplayer