mtg ur dragon commander deck Dragons/Reanimator - Scion of the Ur-Dragon This is of the R rarity. MTG Proxy Ready-to-Play Commander Deck:

Several cards pay big if you hit a "natural 20", with the Deck of Many Things being a particularly impressive example, I should know as I lost to it one game

These cards usually make it more costly or difficult for others to threaten you with combat, either by requiring extra mana or forcing them to give up resources

v1.0.21 A few improvements to reach perfection Awesome

I really enjoy its power in that tribe, and Dragons are, according to EDHREC.com the most popular tribe in Commander and I'd argue general kitchen table play as well, so this is very strong supporting multiple brews in multiple formats as well as leading one in Commander