The best reason to include black in a Squirrel deck is for discard or creature removal as a supporting strategy
Elsha, Threefold Master takes the deck in a different direction, focusing more on a Voltron build that pays you off with a board full of creature tokens
In order to make a great investment, we want to invest in cards which have: Low sentiment Low metagame percentage (relative to potential) Low format interest in the formats they're played in (relative to potential) The last two points are related to the dynamics and trends in the Magic marketplace
On top of that, blitz cards may just serve well for sacrifice matters decks
Of course, this isn't a given but, if you've been watching those price tags rise across the rest of the market recently, it's well worth worth a shot
Or the Pokmon Champions Path Elite Trainer Box with a sealed Charizard V Pokmon card