In a singleton format you have to run a set of cards that all fulfill the same basic function, so instead of running 4 copies of Harmonize, you might run Harmonize, Greater Good, Beast Whisperer, Return of the Wildspeaker, Garruk, Primal Hunter, Shamanic Revelation, Soul's Majesty and Rishkar's Expertise
With power and toughness equal to the number of creature's in its controller's graveyard, Old Stickfingers costs two mana and X to play
Absolutely, it is better than Wild Guess would be in this list
It doesnt really slow people down, as such, but seeks to provide a puzzle to solve
The rest of us can see that its perfectly fair, heh! Illustrated by Vincent Christiaens Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Even among these relatively new collections, you can find enough expensive chase cards to fully fund a pension plan and then some