The problem is that the only one I actually built and played (and still have together) was Thassa, God of the Sea
You also need Nexus of Fate, Isochron Scepter and Mystical Tutor all in your hand
When a player taps a creature for an attacking creature's enlist ability, that attacking creature gets +X/+0 until end of turn, where X is the tapped creature's power
NM copies should sell for more, though it's difficult to say where the ceiling for this card is, given the difficulty in acquiring one in good condition
Of course, this nonbasic land forces you to discard three cards after drawing three, but for decks that take advantage of this drawback such as the ultra-popular, tournament-winning Psychatog deck from this era thats more of a boon than a hindrance