Cards like Arlinn, the Pack's Hope and Vivien, Champion of the Wilds are essential to making this strategy work
It doesn't outright win you games, but it's friggin' awesome
However, Grixis gives you access to plenty of sacrifice and recursion, so just blink or off Sol before he turns, bringing him back to do it all again and potentially buffing Orca in the process
With five different types of mana (swamp, plains, island, forest, and mountain), innumerable creature types, artifacts, enchantments, and other types of spells, there are so many ways the game can be played and so many combinations for decks that it ensures no two games will play out the same way
And it's not even that hard to run through your deck with Innistrad's focus on milling cards off the top of your library
That creature gains reach until end of turn