Harmony, the Librarian

If you would draw a card, you may instead search
the top ten cards of your library for a card and
put into your hand. Shuffle the rest into your
library. This ability triggers only once each turn.
Discard a card with mana value X, choose one:
- Target creature gains +X/+X and Vigilance
until end of turn
- You gain X life
- Counter target spell with mana value X or less