sting mtg card Xira, the Golden When Gatha fell Sting is Bad Flavour-wise :

In those moments, you may only be limited by the number of cards you have available to cast

The First Sliver is a great choice, but getting more eyeless pretties onto the battlefield isn't helpful if they all die in a Fumigate

Wildcards in MTG Arena are digital objects you can trade in or craft for any available card of the same rarity

What is your favorite dinosaur card

What started off as a throw-in mechanic for Fifth Dawn turned into a headliner for the Greek-inspired Theros block

This also means that rather than trying to design a legendary creature of your own making, Id suggest trying to find an existing character from Magic or outside of it that you can lean into to draw the flavor from