Haemir, First of the Wandering

Whenever you play a noninstant, nonartifact spell, you may pay {w/u}{w/u}. If you do, choose one:
- Untap X target creatures, where X is the spells converted mana cost.
- Reveal the top X cards of your library, where X is the spells converted mana cost. Put one card revealed this way into your hand and the rest on the bottom of your library in any order.