The Lord of Locusts

Ward {2}-Discard two cards.
This enchantment enters with 4 seal counters
on it.
Whenever you sacrifice a creature for the first time each turn, remove a seal counter from
this enchantment.

As long as there are no seal counters on this enchantment, enchanted creature gains +3/+3, has Indestructible and "Whenever this creature attacks, tap all creatures defending player controls."