Discord, the Puppet Master

Haste
Hexproof, Indestructible
{p/r}, {t}: Put a grey counter on target creature that does not have a grey counter on it.
{c}, {ut}: Exile target artifact until Discord, the Puppet Master is exiled.
Creatures with grey counters on them lose all abilities, are colorless, have base power and toughness 0/1, and have shroud.