Ursula, The Sea Witch

Whenever you attack, target attacking creature
can't be blocked this turn. It connives. Then
choose another attacking creature with lesser
power. That creature gains double strike until
end of turn. (To have a creature connive, draw
a card, then discard a card. If you discarded a
nonland card, put a +1/+1 counter on that
creature.)
"Poor unfortunate souls." - Ursula, The Sea Witch