Ive seen it played as the 23rd card in a deck, but usually that person would have been better off playing an eighteenth land
PrimetimePokemon's Take: Even though I really liked the ex designs of the three Regis, it is nice to get back to the familiar bubble pattern on the ex cards
Compared to the roughly four-dollar price tag on the regular cardboard version of this artwork in Brilliant Stars, this metal card is roughly double the value

Sort Card Type Dark Quilava #39Uncommon $4.96 Ethan's Quilava #33Common $0.21 Ethan's Quilava #33Common $0.27 Ethan's Quilava #16Common $0.10 Quilava #24Uncommon $0.15 Quilava #91Uncommon $8.73 Quilava #51Uncommon $5.68 Quilava #51Uncommon $5.42 Quilava #45Uncommon $1.69 Quilava #60Uncommon $1.24 Quilava #49Uncommon $1.91 Quilava #49Uncommon $0.94 Quilava #19Uncommon $0.36 Quilava #41Uncommon $0.43 Quilava #10Common $0.29 Quilava #18Common $1.16 Quilava #10Common $2.44 Quilava - 2011 (Christopher Kan) #49Uncommon $13.25 Quilava (46) #46Uncommon $3.65 Quilava (47) #47Uncommon $4.64 Quilava (Delta Species) #36Uncommon $3.50 Quilava - 2011 (Christopher Kan) #49Uncommon $13.25 Quilava #91Uncommon $8.73 Quilava #51Uncommon $5.68 Quilava #51Uncommon $5.42 Dark Quilava #39Uncommon $4.96 Quilava (47) #47Uncommon $4.64 Quilava (46) #46Uncommon $3.65 Quilava (Delta Species) #36Uncommon $3.50 Quilava #10Common $2.44 Quilava #49Uncommon $1.91

If a card like Erdwal Illuminator gives you an extra investigate each turn, a token doubler will double each of those Clue tokens
Understanding these different types helps collectors and players recognize how common or rare a card is, and which ones are more desirable