mtg ur dragon commander deck The Ur-Dragon EDH | Tribal Deck This is of the R rarity. The Ur-Dragon (Future Sight) -

A few of my decks use the Ultra Pro Printed Sleeves (such as the Selesnya sleeves in the photo), and each 80+ Boulder can snugly fit 102 of those sleeves

Instead, put them in play and reap the rewards

SEGA Dreamcast

At the beginning of your end step, choose a card at random exiled with this enchantment and put it onto the battlefield tapped

The ability to ignore black mana and instead use your life as a resource means that you can grant Krrik shadow via Dauthi Embrace for only 4 life, cast and attack with Skithiryx, the Blight Dragon for three mana and 6 life, while also casting your Whip of Erebos, Phyrexian Arena, and Grey Merchant of Asphodel in rapid succession