Its ultimately better than nothing, though rare cards cost you quite a lot of points, and those points arent transferable between sets
[65] Unlike the basic Common and Uncommon, Rare collectables are divided into many different sub-groups, comprising Holo Rare, Reverse Holo, Half Art/Half Body, Full Art/Full Body, Secret Rare, Ultra Rare, Rainbow Rare, Promo, and card mechanics including EX/GX, V/VSTAR/VMAX, and Tag Team
Of course, the majority of opponents have Karn, as well, so fighting over Karn is a big part of the game
It's not just Sonic that this could work for, but really any form of video game movie
Legendary Creature - Avatar Dinosaur Ravenous Tyrannosaurus Devour 3 (As this creature enters, you may sacrifice any number of creatures
Otherwise, you may put it into your graveyard