Like plenty of other Eldrazi, its difficult to reprint these in Standard or accessible sets, so the price tends to drive up as there is always demand for the big Eldrazi
Evasive also helps it stay on the board long enough to get more powerful Sisu out
You can feel relatively safe with some blockers and a good life total and suddenly a small dude gets massive, evasive and double strikes you to death all with just a few mana
Your creatures are generally better in the long run, so using something like Scavenging Ooze or Bonecrusher Giant to block and clean up the board can put you way ahead
With each one, Ive included the mechanics of the cards so you have an idea of what they do, even if all youre buying them for is to be sleeved and stored or just to ensure you have this gorgeous artwork in your possession
The kitchen table is a place that loves to abuse graveyards, and you need tools to answer that abuse