Larissa, The Planner

Vigilance, Superior Plans (Whenever this creature attacks, after blockers are declared, you may choose
how blocks are assigned.)
During your upkeep, if you control a creature with converted mana cost 5 or more, Larissa may copy
one of that creature's abilities. This effect wears
off at the beginning of your next turn.
Pay 3 life: Prevent the next 1 damage dealt that
would be dealt to any target this turn.