Mono-Black can make a ton of mana, so you can easily pay its Commander Tax a few times to get multiple sacrifices, and he just cost's four initially
The Legendary Pokmon Terapagos takes the throne, joined by Cinderace ex, Lapras ex, and Galvantula ex, all wielding brilliant new powers as Stellar Tera Pokmon ex
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Thats a grand total of 6 mana for a 1/1, and you cant even go infinite since its a once-per-turn deal
Unlike almost all the other cheat in cards on this list these are efficient enough that it is plenty good enough just swapping around filler and midrange utility stuff for value
Those same unlimited WotC sets I bought and sold for $40 now change hands regularly for $250-$300 in significantly worse condition