Fukumu, Sentient Container

Contain (Whenever you discard a card, exile
it with a Containment counter on it. You may
cast spells you control from anywhere if they
have Containment counters on them.)
Whenever this creature is tapped, it is a
colorless Hollow Drone artifact creature with
base power and toughness 1/1, hexproof and
indestructible. It can't be blocked.
{u}: Discard a card. Activate only if this card is colorless.