After declaring attackers, you can impulse draw with cards like March of Reckless Joy, build up mana for a card like Leyline Tyrant, or use combat tricks like Lunar Frenzy
But remember this nostalgic phase before entering battle: You must gather your party before venturing forth. Commander Legends: Battle for Baldurs Gate will be available as Draft Boosters, Set Boosters and Collector Boosters, as well as Precon Commander Decks, a Prerelease pack, and a special Commander Legends Bundle containing an oversized D20
If you wish to cast the revealed card without paying its mana cost, you must cast it while Yennett's triggered ability is resolving
Most of the Eldrazi are easier in the decks that might play such things
But you aren't drawing more, so it's card flow, but not card's drawn, if that makes sense