mtg spirit dragon commander deck Scion of the Ur-Dragon This is of the R rarity. Call the Spirit Dragons is

First, it removed the creature from the game and we avoid "remove from game" effects in the base set

Lurrus of the Dream-Den One of Magic's best creatures, Lurrus of the Dream-Den is one of those cards that finds itself at the top of pretty much any list it qualifies for

These are the kinds of cards that pay off lifegain in Golgari, just like your commander

I'll also give you two of my Honorable Mentions making this essentially a Top 12

Cloud has Haste, which, in MTG terms, means he's able to attack on the first turn he's summoned

The field is stacked with elite talent, including top finishers from Regional Championships, online qualifiers, and past Pro Tours