Falkenrath's Crimson Rite

(You may cast a legendary sorcery only if you control
a legendary creature or planeswalker.)
Destroy target creature or planeswalker, then put
X +1/+1 counters on target creature, where X is
the converted mana cost of the permanent
destroyed this way.
"The discomfort shown by the others is amusing, but
none can deny that my work has made quite the
splash."