After a 4-mana investment, youre looking at at least three Treasures by the time your turn comes back around, and even more as the game ramps up and your opponents start drawing cards off their Brainstorms and whatnot
The sudden life gain also puts you out of range of being killed by a well-timed swing from your opponents, giving you the breathing room to finish them off with your growing army
This whimsical deck has a real mean streak
The new moves introduced in this generation were Ominous Wind, an Ancient Power clone which briefly became a Flying coverage move, Shadow Claw, a decent coverage move that is the strongest Physical Ghost-type in this generation and the next one, and Shadow Sneak, a famous Ghost-type priority move which sadly has no Quad Weakness to abuse in this generation, and outside of Psychic/Ghost, none
Non-Phyrexian creatures enter the battlefield tapped