Adalous, of Fallen Power

Whenever a creature you control attacks it gains "Discard a card: This creature gets +1/+1."
Creatures your opponents control gain "This
creature cannot block unless you discard a card,
or if you have no cards in hand."
"When Adalous's terrible jaws opened, the fallen
arose, and the powerful kneeled."
-The Etchings of Glindi