As well as the Sonic -themed art, there is some flavor text featured at the bottom of the card, quoting Tikals Prayer from the original Sonic Adventure
Tinker is (of course) banned from play in almost every official MTG play format, and is Restricted (meaning you can only have just one in your deck) in the almost-anything-goes Vintage format
In this deck we can leverage it to counter spells with Disruptive Pitmage and Voidmage Prodigy, destroy artifacts and enchantments with Nantuko Vigilante, or remove creatures with Skinthinner
you can flicker both creatures to untap five lands and return Ghostly Flicker to your hand, then repeat the process
They sell Product B and then use the money to buy Product C
Jolrael, Mwonvuli Recluse and Morska, Undersea Sleuth are examples of commanders that want you to play more card draw than normal