Counterlash | Magic: The Gathering
Formats Counterlash is Legal in
Official Oracle Text for Counterlash
Official Rulings for Counterlash
1/22/2011 : If you cast a card "without paying its mana cost," you can't pay any alternative costs. You can pay additional costs, such as kicker costs. If the card has mandatory additional costs, you must pay those.
1/22/2011 : If the card has in its mana cost, you must choose 0 as its value.