Strength of the Contender

Cast Strength of the Contender only before
your combat phase.
Choose a creature you control. It attacks alone,
gets +6/+6 and gains indestructible until end of
turn. Then, each of your opponents' creatures
block it if able.
If five or more creatures leave the battlefield
during this combat phase, you gain 10 life and
you may exile 3 target permanents.