The myriad lets him swing at anyone and make free tokens for the others attacking
What it does is a little less cozy for your opponents: each player is forced to sacrifice all creatures they control that don't share a type with the one you choose for them
To eliminate this tempo loss, I suggest adding the following creatures: Ardenn, Intrepid Archaeologist, Auriok Windwalker, Halvar, God of Battle to attach equipment to Wyleth or any other creature Armory Automaton, Kazuuls Toll Collector as backup creatures to attach equipment to Sigardas Aid, which is already in the precon, can also help to reduce the cost to equip
In the rare case that the target land is a legal target as Preston Garvey's first ability resolves but the target land can't legally be enchanted by the Settlement token, the token won't be created at all
The card is also the ultimate trump in midrange mirrors the direction that I think the format is going to be moving