With a mix of ETB effects and stax pieces, this deck can slow down opponents while building up its board presence, and it plays very well with mana rocks for ramp
However, purchasing individual cards or even building an entire deck can quickly become expensive, which is where print MTG proxies come in
That keeps your hand full and gives you the tools to quickly snowball your board presence
With that in mind, I would advise against holding onto copies if opened
Where Cultivator Colossus really shines is a kill card for decks that have a lot of land (and here's our callback to Wrenn and Seven)
We think you can agree that with this and Underground Sea on the list, it must mean the combination of Red, Blue and Black must be the best one in Magic - and that means Nicol Bolas is probably right