Unfortunately, he does wait until the end of your turn to do this, so he wont be able to trigger owyns ability all on his own
Every deck is built around its leader the leader's colour defines which cards are allowed in your 50-card main deck, and the leader's ability shapes your entire strategy
Likewise, Floodgate can be flickered, too, and it might actually kill some things
Meanwhile, Tawnos, Urza's Apprentice is a Panharmonicon for artifacts that costs a bit of mana but can copy activated abilities as well, which of course means it's the Commander I'm most excited to build around
While it may not dominate the meta, it gives casual decks a fun high ceiling in battle