Ralsei, Prince of the Dark

Whenever a creature you control is dealt damage
and doesn't die, you get that many tension point
counters.
Use 2 tp counters: Exile target creature with
power or toughness 1 or less until Ralsei leaves
the battlefield. Only activate this ability as a
sorcery and once per turn.
Use 5 tp counters: Prevent the next 5 damage
that would be dealt to a permanent you control.