Prioritize Dragons with impactful ETB or attack triggers so each copy immediately generates value
Well, there are cards that change this dynamic, either giving you a huge benefit when you discard your own cards or by punishing people for having few or zero cards in hand
Whenever an opponent mills a nonland card, if this creature is in your graveyard, you may return it to your hand
The biggest gainer of the week was Kinsbaile Cavalier with the Knight payoff shooting up a massive 350% to $20
If you're worried about losing life from fetchlands, why not just go with the financially painless Evolving Wilds + Terramorphic Expanse at the cost of them putting lands in tapped (not that that matters, as long as they shuffle) or Ghost Quarter so you don't have to pay life
A fair number of other horses have lower power than Shadowfax, so it should be great at cheating out some extra attackers