Drown in the Loch

Oracle Text
Choose one —
• Counter target spell with converted mana cost less than or equal to the number of cards it its controller's graveyard.
• Destroy target creature with converted mana cost less than or equal to the number of cards it its controller's graveyard.
Also, the only other Modern-legal (conceivably) universal hard counters I could find requiring only two mana and a single blue:
- Corrupted Resolve
- Second Guess
- Spellstutter Sprite
- Unified Will
And it kills creatures. And is uncommon. This is amazing.