Marwen Cairne, Pain-Knight

Changeling (This creature is all creature types at
all times)
Lifelink, Vigilance
{t}{x}{w}{b} Marwen Cairne, Pain-Knight does X
damage to target creature and itself.
You gain X life.
{t}{x}{b}{g} Marwen Cairne, Pain-Knight does X
damage to itself. It gets +X/0 and trample until
end of turn.