Schism Harvestman

{b}{b}{t}, increase Umbra counter by 1.
Obscured
(Umbra: When Umbra is higher than 0, all
players may cast no more than 10-X cards per
turn, where X is the Umbra counter. Cards that
have Obscured or a mana cost of 6 or higher are
excluded from this limit. If a permanent is cast
with a mana cost of 6 or higher, remove one
Umbra counter.)
A gruesome parasite larger than its host,
joined together at the neck stumps.