Rats are your main theme here, but keep an eye out for effects that force your opponents to sacrifice creatures like Flare of Malice
This might sound familiar if youve looked at blues selection of conditional mana ramp cards, but instead of being tied in with artifacts, instants, or sorceries, blacks conditional mana ramp and acceleration options tend to rely on the number of Swamps you control and creatures dying or existing in your graveyard
You often see this creature alongside equipment like Batterskull and Kaldra Compleat that are disgusting threats when you play them for
It's an artifact with ", Sacrifice this token: Draw a card.") Whenever a creature you control enters, if its power is greater than this creature's power or its toughness is greater than this creature's toughness, put a +1/+1 counter on this creature and investigate
Even if one is countered, though, you'll still have another copy ready to go for your next turn, again, provided that the initial copy resolved successfully