Spend

only

black

mana

on

X.

Drain

Life

deals

X

damage

to

any

target.

You

gain

life

equal

to

the

damage

dealt,

but

not

more

life

than

the

player's

life

total

before

the

damage

was

dealt,

the

planeswalker's

loyalty

before

the

damage

was

dealt,

or

the

creature's

toughness.