Perhaps he'd also be a good ramp option for Obeka, Brute Chronologist, who could end the turn to skip the land-return drawback
As a five-mana 4/2 that discards your hand and draws three cards, the Ox is okay
That being said, Darigaaz gets a lot stronger the more ways you have to slow the game down, so he works pretty well as the finisher for a board-wipe heavy control deck
All you do is attack with the Jumbo Cactuar, and in response, cast Fling to sacrifice him and deal 10,000 damage to any one player
The pearlscent packs with Beholder on them are gorgeous, and reflect how much of a hidden gem the premium pulls are in the Collector's boosters
These cards are not remotely as powerful as the best ways in all Magic to cheat creatures onto the battlefield, but its not difficult to conceive of an environment where these are among the more powerful cards