After the prologue concludes, you and your party choose where to go next, and wherever you go determines what scenario you play
Ivy Lane Denizen each new creature grows your existing ones, making your army even more dangerous
However, with so many Monsters on the field, you could easily use them as material for Extra Deck Summons
If you like a little heat, ask for the different salsas and pair them with the tacos you choose
You can't attack or block with a Planeswalker, but they're also not affected by summoning sickness and can use their Loyalty abilities as soon as they enter the battlefield
Overall, I would say I am pro-sleeving if the game gets to the table often or is played around particularly messy audiences, but I completely understand some peoples apprehension with the idea of sleeving all games