Opening Stellar Crown Premium Checklane Blister [Miraidon] returns about $4.38 in card value against its $20.99 price — roughly $0.21 back per dollar spent. On current prices, you lose money on average by opening it.
See every card and pull rate in Stellar Crown
How expected value is calculated — card value only, from published pull rates and daily market prices.
Stellar Crown Premium Checklane Blister [Miraidon] on TCGplayer