Mortis

This card phases out if you have more than 10 life remaining
{t}{r}{r}{r} Destroy target creature, enchantment
and artifact
{b}{b}{b}{ut} For each point of damage dealt this
turn, add that many +1/+1 counters to Mortis
If this card is destroyed, all other players must
sacrifice their highest mana cost creature, or
suffer 10 damage