what does the numbers on pokemon cards mean do symbols cards? How to Read Pokemon Card

You'll have to change them for cards that are legal in the format you've selected, or else Arena will show you an Invalid Deck error

Triple Effect Tin [Flareon] $246.67 Elemental Power Tin [Flareon GX] Eevee Evolutions Tin [Flareon V] $69.82 Flareon VMAX Premium Collection $296.52 Eevee Evolutions Tin [Flareon V] (Live Code Card) Flareon GX Special Collection Darkness Ablaze 3 Pack Blister [Flareon] $44.18 Evolving Skies Elite Trainer Box [Flareon/Jolteon/Umbreon/Leafeon] $605.04 Dark Flareon #35Uncommon $7.29 Flareon #10Holo Rare $82.43 Flareon #5Holo Rare $113.32 Flareon #5Holo Rare $88.28 Flareon #2Rare $22.54 Flareon #19Rare $11.99 Flareon #19Rare $12.26 Flareon #26Uncommon $10.19 Flareon #44Uncommon $7.48 Flareon #12Uncommon $3.75 Dark Slowking #20Rare $38.19 Light Jolteon #48Uncommon $75.48 Unown [Z] #60Uncommon $7.33 Dark Croconaw #32Uncommon $5.27 Unown [G] #27Rare $14.86 Dark Houndoom #7Holo Rare $170.05 Dark Quilava #39Uncommon $4.96 Light Ledian #24Rare $17.34 Dark Ursaring #21Rare $13.50 Dark Magcargo #18Rare $3.97

Even better if you're copying something that gives you energy on attack, like Razorfield Ripper

Doctor Who: Blast from the Past This precon is from the Doctor Who set, and is helmed by The Fourth Doctor and Sarah Jane Smith as his companion, but actually includes EIGHT of the Doctors from the legendary TV series

1 Herd Baloth

Many of the cards felt like they were designed as popular mechanics first and had the most talked about FF games of our generation slapped on them