First, cast Thornbite Staff for two generic mana, and then pay the four generic to equip it onto Marrow-Gnawer
The Koraidon card, in particular, uses the same pose and composition as the Full Art Koraidon EX card, only now with a shiny golden finish
Because he requires some setup to really get a ton of value, he is more of a late game card
Top valuable gems include It Means No Worries, Desperate Plan, and Perdita cards
WotC notes that the card promotes a lot of fun angles for Commander players, and while powerful, the green artifact can be interacted with and requires some setup to get into play
I picked one and dragged my finger across the top seam of the pack, digitally slicing it open