having fling in the hand makes any loss of vehicles a gain
And all you need to do is just have another creature saddle your Drover Grizzly
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The slower speed isn't too big of an issue outside of powered cubes and helps at one end of the scale to reduce the polarity of the card
It saw a lot of play in its Standard as a way to take extra turns by paying the 7-mana cleave cost, but also allowed you to combo off early via the pure red version
Uthros Research Craft Uthros Research Craft would be a good enough card at 4 mana, with the text draw a card when you cast an artifact. Thats incredibly powerful, especially on a permanent that doesnt die to every piece of spot removal or board wipe, unlike similar effects like Jhoira, Weatherlight Captain and Vedalken Archmage