Kog'Maw, Caustic is a Riftbound card. Compare listings from Singapore Riftbound sellers on CardJio, then jio them on WhatsApp.
[Deathknell] — Deal 4 to all units at my battlefield. (When I die, get the effect.)
[绝念]—对我所处战场上的所有单位各造成4点伤害。（当我被摧毁后，发动此效果。）