All Black decks have access to Bojuka Bog and any deck can add Scavenger Grounds, and there are tons of efficient artifacts that hate graveyards like Soul-Guide Lantern
Its not uncommon to have six or so creatures and enchantments in play with a Selesnya deck
Walk into Weevil Cards & Collectibles instead, and you can hold the card in your hand before you pay for it
I think this is an important sideboard tool for red decks that are looking to take a more controlling position against creature decks, and while Rabblemaster is not very strong against something like Elves, this card would be especially brutal there
Personally, Ive always thought that the best evidence for the Topsun non-holos being produced before Bandai Carddass Series 1 is that Mew is not in the Topsun set
Token generation, built-in protection, and a decent card on rate