Im just speculating, but Im guessing the lack of horses comes from them taking a back seat to whatever happens to be riding them, despite how theyre kind of essential to fantasy storytelling
This spoiler just confirmed that it will probably be the best deck in the format until it's banned
For four ink or exerting a big singer you can dish out a massive five damage to any character or location of your choice
Put 2 +1/+1 counters on it
Whenever you attack, for each opponent, create a 1/1 white Human creature token thats tapped and attacking that player or a planeswalker they control
This is a very powerful deck that takes advantage of the new domain mechanic, combined with a number of dual lands, to summon huge creatures, product a ton of creature tokens, and absolutely overpower your opponent in the mid- to late-game