Insects, Leeches, Slugs and Worms (with an O not a U) all trigger the life drain ability, so you could build this as a kindred typal deck, giving it some flexibility
Most of these cards are set on Innistrad, where fans will see some familiar characters, and a few of them call back to earlier sets in the current rotation
Illustrated by Igor Kieryluk
A decreased mastery score can bounce back within a few XtraMath sessions if a student restores their focus
The rules will not spell out which category an ability belongs to, but experienced players can usually recognize the different language or formatting associated with each of them
Many shops and individual sellers base their sale prices off of TCGPlayer market pricing for time efficiency