Malenia, Blade of Miquella

Eminence - As long as Malenia, Blade of Miquella is in the command zone or on the battlefield, other creatures with Poisonous cost {1} less to cast.

Poisonous, Lifelink, Deathtouch

Whenever a player gains one or more poison counters, place an additional poison counter on target player then gain life equal to the number of poison counters on that player.