Does Scrapyard Champion's effect trigger if you have 1 or fewer cards in hand when you play it?

Ruling: Yes, the effect triggers. You discard as many cards as you can (including 0 cards) and then draw 2.

Nuances:

• As a general rule, you always do effects as much as possible
• Exceptions are when something is an additional cost or if the effect explicitly specifies "do X to do Y" or "do X, if you did, do Y" or similar phrasing