5 Ornery Tumblewagg - Vadmir, New Blood +1/+1 Counters And An Early 6/6 Both Ornery Tumblewagg and Vadmir, New Blood are cheap creatures that can get big fast while deploying Vadmir's passive ability early
The problem is the number of other six-drops that seem good in the deck, like Nissas Renewal, Greenwarder of Murasa, and Conduit of Ruin
While providing sacrifice fodder
The only reason this sees play is that there are lots of cards that make playing artifacts much easier, Mishra's Workshop for one but in fairer formats there are still plenty such things
This card is curve-appropriate, has haste, and additional combats make your dragons even scarier
The community outreach is the sole reason Id recommend it