Many people think of the old-school precons like the Kaalia of the Vast and Edgar Markov decks as highly powerful
If you're interested in a deck with a proven track record, no glaring weak spots, and an unstoppable card advantage engine, I'd highly recommend playing Mono Black Control
Saruman the White Saruman the White can amass a good number of orcs if youre playing a spell slinger deck, especially if youre casting spells on other players turns as well as your own
And once each opponent has a counter we can proliferate the poison until they die with cards like Flux Channeler and Experimental Augury
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Buswhack has also been used in Standard to great effect in Golgari shells that include Phyrexian Obliterator by forcing your opponent to fight the Obliterator, then watching them sacrifice all of their permanents, all for one mana