MARI, Picnic Hostess

When you gain life, you gain two times that life rounded down.
Once per turn, anytime you would lose life,
you gain that much life.
{2}{u/b}: Target creature gains lifelink.
{x}{w}: Place a X/X counter on target creature.
{5}{b}: Sacrifice 5 creatures: You gain life equal to
their power, rounded down.
When MARI dies target creature
takes 143 damage.