Typically, that'll be your turn, but that could be instant token makers like Raise the Alarm or lands like Mirrex and Castle Ardenvale or Mobilization or with flash enablers like Yeva and Leyline of Anticipation
Its a good aggressive option that flips into the perfectly fine Gideon, Battle-Forged, and its the best commander for an actual Gideon themed deck
Jetsam, however, is a card that I wish were standalone so that I could play more copies in more decks
Then it has a cast trigger for historic stuff to Bolt any target, from stuff to players
Horizon world is built on pillars such as its majestic nature, unique machines, and diverse tribes, and the Wizards of the Coast team did an amazing job bringing all of that to Magic format through stunning artwork and fitting card mechanics
With a Greens Exploration engine it makes every search that much more important to set up future turns or simply keep yourself alive for the time being