You may put any number of permanents from it onto the battlefield
For those unfamiliar, the term aggro is short for aggressive, and in this case, refers to a strategy that seeks to put lots of low-cost cards into play and gain enough of an advantage to win before the opponent can stabilize
Players will still be able to craft Jumpstart cards for use in Constructed play after the event ends
Here are some that I like: Stuff like Timely Reinforcements or Hornet Nest strikes me as too narrow - cards you wouldn't want to maindeck, but would only bring in as a sideboard swap for certain match ups
Once you get it flipped, its a win condition in its own right, with the ability to make a player lose the game if theyve taken 10 or more damage from the Vessel of the All-Consuming
Absorb is not a powerful card, it is just a wonderfully appropriate one and still gets a lot of play as a result