The target creature can still block other attacking creatures.
01-02-2014
wotc
The activated ability granted by Fearsome Temper can’t change or undo a block that’s already happened. For it to have an effect, you must activate it no later than the declare attackers step.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.