Playing it as a second mana creature in decks trying to go big is already promising, and Incubation Druid is superior to Druid of the Cowl in this respect because it can fix your mana for double-colored cards and in the lategame adapt into a real threat or supercharge any mana sinks you might have in these aggressively-slanted midrange decks
If your opponent is playing Ruby, consider whether it's wise to spend your entire inkwell on a 7-cost character like Starkey or Pluto when it's likely they'll have a removal action waiting for them
This means that when they deal combat damage to a player if they aren't renowned, you put a +1/+1 counter on them, and they become renowned
There are many ways to take advantage of this Jeskai commander with cards like Intangible Virtue and anthem effects that buff fliers, birds or both
Shardless Agent has changed the format probably the most in enabling 2 entire archetypes, Living End and especially Temur Rhinos, being absolute top contenders in the format