Opening Silver Tempest Premium Checklane Blister [Gallade] returns about $5.87 in card value against its $22.99 price — roughly $0.26 back per dollar spent. On current prices, you lose money on average by opening it.
See every card and pull rate in Silver Tempest
How expected value is calculated — card value only, from published pull rates and daily market prices.
Silver Tempest Premium Checklane Blister [Gallade] on TCGplayer