the soul stone mtg card #242 (Raised Foil) from Marvel's Spider-Man (SPM) Proxy Man Art Series Rarity MTG Arena's Latest Reveal Renames

I might add a few more creatures with enters-the-battlefield triggers (definitely dealers choice here), to take further advantage of this playor just add Panharmonicon

Arid Mesa - Expensive fetch land that keeps mana consistent but at $45 a pop the deck can live without them if you want to keep the deck cheap

Illustrated by Vance Kovacs Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp

And the final loyalty ability is an absolute game-ender if you can reach it

The main attraction here is that you can pay two mana to search your library for a Dragon and then have Scion turn into it for the rest of the turn

If they do, they draw a card