Covid-19

Enchant target creature or player.
Enchanted players take one damage during their
end step and enchanted creatures get a -1/-1
counter during each player's end step. When a creature enchanted with Covid-19 deals damage
to a creature or player, that creature or player is enchanted with a copy of Covid-19. When an enchanted player is dealt damage by a creature,
that creature is enchanted with a copy of
Covid-19.