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You can obtain the Machamp ex (2-Star Shiny rarity) card by opening Celestial Guardians: Solgaleo from Celestial Guardians set

For everyone else, the new set goes on sale and will be added to Pokmon TCG Live on March 31, at which point a new era of Pokmon TCG will begin.

His ability can easily be exploited, creating one of the quickest and simplest ways to accrue a ton of lore in a single turn

Statistical Yearbook 2018 (PDF)

Deathrender It's just in 2,720 decks and that's pretty small for such a useful ability, and it's just a few dollars on the secondary market so that can't be the reason you haven't played it unlike more expensive options

If its targeted by an effect monster, it lets the player look at the opponents hand and discard a card