Prices of staples often slip during restocks, then settle at a fair level
Whenever a land you control enters, each landfall ability of the permanents you control will trigger
Others are abilities that help a card break rules, like Rush on an Item card like White Rabbits Pocket Watch
(When this equipment enters create a colorless 1/1 Hero creature token and attach this to it.) Equipped creature gets +2/+2, has trample and haste, and is a Samurai in addition to it's other types
Bringing a playmat to the prerelease isnt as important as those first few recommendations, but its a great luxury if you have one to use
Kuzco Panicked Llama, Pacha Emperors Guide, and Pluto Determined Defender are all options