Initially I was not a fan of the Looting in RDW but having now both played it and seen it played by other people I am completely sold
Of course this card draws a lot of attention from your opponents, it's one of the most terrifying things that you can play early in the game, and for only 2 mana, it doesn't even set you back at all if they burn a spell to try and kill it
If they guess wrong, you get to cast it for free
Any noncreature artifact getting sacrificed will hit each opponent, which potentially makes it playable in eternal formats
Going back the original example many paragraphs ago, let's look at the two cards you milled away: Milling the Gearhulk, if they are playing a Constructed deck, is likely an indicator they have even more Gearhulks
Just like the previous card, this likes untappers of lands or permanents and combos with Earthcraft to make infinite 5/5s that are tapped