Many of the major grading companies, such as Professional Sports Authenticator (PSA) and Beckett, have a booth at conventions or trade shows for collectors to authenticate your cards
The difference is that Wizards Rockets charges up by paying and tapping it, then you sacrifice it to get X mana in any colors you choose, letting you filter more than just 1 mana

Sort Card Type Koga's Weedle #82Common $1.29 Weedle #69Common $0.65 Weedle #69Common $4.43 Weedle #100Common $0.53 Weedle #70Common $0.82 Weedle #1None $0.18 Weedle #1Common $0.30 Weedle #1Common $0.12 Weedle #99Common $0.73 Weedle #86Common $0.57 Weedle #87Common $0.53 Weedle #93Common $0.35 Weedle #86Common $0.31 Weedle #69Common $0.47 Weedle #1Common $0.31 Weedle #1Common $1.26 Weedle #3Common $0.26 Weedle #1Common $0.20 Weedle #5Common $0.09 Weedle #1Common $0.22 Weedle #2Common $0.37 Weedle #1Common $0.05 Weedle #1Common $0.13 Weedle #13Common $0.15 Weedle #1Common $0.16 Weedle #13Common $0.12 Weedle #1Common $0.21 Weedle #1Common $0.10 Weedle #5Common $0.28 Weedle #1Common $4.95 Weedle #1Common $1.88 Weedle - 002/095 #2Common $0.74 Weedle - 003/095 #3Common $0.75 Weedle - 1/12 #1Promo $12.43 Weedle - 2009 (Stephen Silvestro) #93Common $2.86 Weedle (114) #114Common $33.40 Weedle (115) #115Common $26.04 Weedle (2) #2Common $0.26 Weedle (3) #3Common $0.18 Weedle (Master Ball Pattern) #13Common $14.06 Weedle (Mirror Holofoil) #1None $1.00 Weedle (Poke Ball Pattern) #13Common $0.43 Weedle (114) #114Common $33.40 Weedle (115) #115Common $26.04 Weedle (Master Ball Pattern) #13Common $14.06 Weedle - 1/12 #1Promo $12.43 Weedle #1Common $4.95 Weedle #69Common $4.43 Weedle - 2009 (Stephen Silvestro) #93Common $2.86 Weedle #1Common $1.88 Koga's Weedle #82Common $1.29 Weedle #1Common $1.26

Wrap Up Infernal Kirin | Illustration by Carl Critchlow I love the flavor behind the arcane spell subtype
Lilo - Best Explorer Ever (Enchanted) This adorable Lilo - Best Explorer Ever card isnt a reprint, and grants Challenger to allies
Especially if you build an aggro deck, its the lowest barrier-of-entry to the incredible world of Constructed Magic