Not normally, but if Shellephant has first strike, double strike, or triple strike, and the creatures it's in combat with have none of them, you can deal damage as a 3/3 and then change it to a 1/4 before normal damage happens
If you somehow venture into the dungeon while a room's ability is on the stack, you will continue on in the dungeon
Only a single word was changed, but its an important change: it means you can banish your own character if you want to
This wont be remiss for MtG veterans, but Ive found across other pre-con products this sort of information invaluable, moreso for newcomers and kitchen table players who arent as well versed in all the strategic angles of each color
Stores that are already part of the Hobby Store Program and have held events previously should have been sent details