Forum:WHen do you pay the cost for Panther Warrior/Mist Valley Falcon?

I'm just wondering, just when do you have to pay the cost to let Panther Warrior or Mist Valley Falcon attack? I always thought it was during the Battle Phase, right before you declared an attack with them, but I keep on seeing talk about combos done with MVF, and I have to wonder if that is indeed the case. SynjoDeonecros (talk • contribs) 20:52, May 14, 2011 (UTC)