You dont choose targets for which creatures to steal until youve tapped your own creatures, so if the bearer of the sword is tapped, then your newly tapped creatures will be getting +2/+0 when youre choosing creatures of lesser power
Of course, this ability is a significantly weaker in a multiplayer game, but chances are, the players who are not targeted by its ability won't see it as a threat, so it's not at a big risk of being removed from the board
If you have a Necron Dynasties precon and are looking for cards to upgrade with, this one can be very powerful
Each turn Urza gives you a Karnstruct, an artifact creature that gets +1/+1 for each artifact you control
Casting Cost: Card Type: Creature - Elemental Incarnation Power / Toughness: 3 / 2 Card Text: Flash Lifelink When Solitude enters the battlefield, exile up to one other target creature