Chained Kvazar

Defender, Trample
{4}{g}: Put an escape counter on this creature.
Then, if it has three or more escape counters
on it, it loses defender.
When Chained Kvazar loses defender, it
consumes 6 (An opponent of your choice
may sacrifice any number of creatures with total
power 6 or more. If they don't, they lose 6 life.)