Enlist (As this creature attacks, you may tap a nonattacking creature you control without summoning sickness. When you do, add its power to this creature's until end of turn.)
Whenever Guardian of New Benalia enlists a creature, scry 2 (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.).
Discard a card: Guardian of New Benalia gains indestructible (Effects that say "destroy" don't destroy that permanent. An indestructible creature can't be destroyed by damage.) until end of turn. Tap it.