Eli, Emperor's Aid

Whenever a Legendary Creature enters the battlefield under you control, put your choice of a Haste, First Strike, or Vigilance counter on it.
Sacrifice Eli, Emperor's Aid: Give all creatures you control Indestructible and "This creature cannot be sacrificed" until end of turn. If a Legendary creature you control would be more than its toughness in damage this turn, put an Indestructible counter on it.