Royal Poisoner

Whenever Royal Poisoner deals damage to a
player, that player gets a poison counter. (A
player with ten or more poison counters loses the
game.)
{1}{p/b}{p/b}: Target creature you control gets
"Whenever this creature deals damage to a
player, that player gets a poison counter" until
end of turn. ({p/b} can be paid with either {b} or 2 life.)