The difference is that the land goes into your hand if no one controls more than you, similar to Scholar of New Horizons
They can also be played in Draft and Sealed
The reasoning behind this was that there were some players who disliked DFCs, a number of them being Wizards employees, and they were worried they'd be a colossal flop
Signaling doesn't mean winking, shaking your leg under the table, or tipping your baseball cap three times
Saheeli generates a point of energy whenever you play an artifact or an artificer, and then has the option to spend three energy, at the start of combat, in order to create a 5/5 artifact creature token that's a clone of another permanent that you control
In addition, each Prerelease Pack has one of six borderless scene cards that make up Bilbo's Birthday Party scene included as a foil-stamped traditional foil promo card