Unlike Wheel of Fortune, you can activate Memory Jar during your opponent's turn
Costing just one black to cast and two more to equip, it gives the equipped creature +2/+0 and deathtouch
However, none of these cards can perform the action of gaining you additional cards as early as turn one, and with the Amethyst Chromicon, while it can net you an additional card on turn two, it does so for your opponent as well
Poison the Cup Image Whats good about this card
She's a popular Commander for soupy good-stuff type decks, shows up in Modern and Pioneer, and there are even competitive Legacy and Vintage decks that cheat her into play
Cruel Somnophage Without the Blue side, this needs about three creatures in graveyards to be on-rate (and counting casting the Blue side, arguably closer to five.) Depending on creature density, that may not be too hard