It also helps that this is an Azorius precon, meaning it only uses white and blue mana, keeping things simple for new players, but the volume of colorless cards also means you should never be short of cards to play, so long as you have mana on the board
I like Overlord of the Mistmoors most because its in the primary blink color, it's a solid token generator in white, and the impending creatures are incredible if you can flicker them
Zopandrel, Hunger Dominus is another good way to do the thing, as is old faithful, Craterhoof Behemoth
You can't choose to pay their mana cost and may not pay any other alternative costs
Playing Jumpstart is easy: just open two Jumpstart Boosters, shuffle them together, and start playingthe deck-building process is done for you
If the return from the sacrifice is good you are getting value even without a one of the engine cards