Breena kicks all that off on turn three, and can gain a load of immediate value if anyone is tapped out against your one- or two-drop
Basically, people felt that the set missed its mark, and its for that reason that a lot of people were a little concerned about this years Modern Horizons 2, especially given Wizards of the Coasts commitment to printing new Commander cards in every set possible - sometimes even if it doesnt feel like it needs to
You can only use it counter a creature, though
There are three primary ways to win with tokens: You attack with enough creature tokens that your opponent cant possibly hope to block them all, You pair your token generation with Mirkwood Bats, Impact Tremors, Zulaport Cutthroat, and similar effects that drain your opponents life total as your tokens enter and leave the battlefield, or You have sacrifice outlets that let you cash in tokens to kill blockers and/or drain your opponents life, like Goblin Bombardment