Only limitation is the colors, but it will function well for you if you can cast it
Politics gets a little trickier when youre clearly ahead, however, as people are often less inclined to make concessions to the player whos winning
By combining aggressive combat tactics with sacrifice outlets and drain effects like Cruel Celebrant and Bloodtithe Harvester, you will overwhelm your opponents through both overwhelming combat damage and relentless life drain
As for the plane itself, theres a little to work with in Orzhov both for enchantment and lifegain synergies, although neither are naturally prominent in this precon
The only type you have more than one of is Vampire, and that's not the type you really want to be defending with the uncounterable ability
The phrase 'fetch land' refers to a non-basic MTG Land card that can be sacrificed to search your library for a specific land