Rakdos, Lord of Riots was first released in the set Return to Ravnica, illustrated by Vincent Proce
You can have more than one background card as part of your 99, but you can only have one background as a second commander
If one of the creatures it returned would leave the battlefield, it'll be exiled instead
9 Fang, River City An Impenetrable Fortress For Your Forces It may be too early to properly assess the power level of Into the Inklands new Location cards, but if any of them have a chance of seeing play, Fang is certainly on the shortlist
If you're buying for the card itself rather than the number on the label, a PSA 9 gives you 99% of the visual experience at a fraction of the price
Then theres also cantrips (Ponder) and cards that can be drawn from ETB effects of various spells (Spirited Companion)