Syndra, The Dark Sovereign

Each time you cast an instant or sorcery, put
Storm charge counters on this creature
{r}{u}{b}, Remove all charge counters-Choose one:
Draw X cards, where X is half the amount of
counters removed this way rounded up.
Deal X damage to any target where X is half the
amount of counters removed this way rounded
down.
Search your library for a card with converted
mana cost of X, where X is half the amount of
counters removed this way