Don't believe anyone who will tell you otherwise, including Richard Garfield
Thats where Hearth Elemental comes in as a second source of efficient advantage and I have been overall impressed with how it plays, especially with all of the sources of trample in the deck
Then, in your upkeep, you can toss +1/+1 counters on a dragon you control for each color
There might be some combo lines available with a big land creature each turn, but outside of those this seems pretty mediocre unfortunately
Commander damage kills can be a legitimate method of victory, or you can leap ahead of the rest of the table just by virtue of sheer, overwhelming card advantage
The Mythic Rare has Flying and First Strike on a 5/5 body with a cost of 3RR