The Ur-Dragon also has a game-ending effect once it hits the board, refilling your hand and slamming more dragons into play for free

Scientists Aang's Journey Absorb Vis Ainok Guide Analyze the Pollen Ancient Excavation Ash Barrens Atalan Jackal Attune with Aether Battle Plan Beamsaw Prospector Beanstalk Giant Beanstalk Giant Beneath the Sands Bioengineered Future Biomechan Engineer Biotech Specialist Bitterthorn, Nissa's Animus Borderland Ranger Borough Backup Braidwood Sextant Brave the Wilds Bushwhack Campus Guide Caravan Vigil Case of the Shattered Pact Centaur Rootcaster Changeling Wayfinder Civic Wayfinder Colossal Collision Coming Attraction Compass Gnome Dance of the Tumbleweeds Dauntless Scrapbot Dawntreader Elk Deathsprout Deep Reconnaissance Demolition Field Dig Up Diligent Farmhand Dismissive Denial District Guide Divert Disaster Double Play Dune Mover Earthbender Ascension Ecologist's Terrarium Edge Rover Edge of Autumn Elanor Gardner Elfhame Sanctuary Embermouth Sentinel Embodiment of Spring Emergency Eject Emergent Sequence Environmental Sciences Environmental Scientist Escape Tunnel Everything Pizza Evolution Charm Evolving Wilds Exploding Borders Fabled Passage Fall to Earth Far Wanderings Farfinder Farhaven Elf Fiery Fall Font of Fertility Forceful Cultivator Fountainport Bell Frenzied Tilling

Mox Jasper the latest Mox to be criticized as not good enough (Im inclined to agree), this is its place to shine
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This ability triggers when you spend three mana of a single color towards the casting cost of a spell
It is just as well he is a lot of monster for what you pay as he doesn't really fit in well anywhere, he just makes up for it in power