Coronavirus

When this virus enters the battlefield, put a Virus counter on up to {x} target creatures.
You get an antibody artifact. If a card attacks or is attacked by a creature with a Virus counter on it,
put a Virus counter on that creature. If a creature
has four or more virus counters on it, that
creature dies.
{t}, put a virus counter on one target creature.
The only things that can destroy the Coronavirus
are if an opponent gains control of your antibody