Special Conditions are effects that are applied to your Pokemon Cards that affect them in between turns
If this card is sent from the field to the GY: You can make all "Gouki" monsters you currently control gain 500 ATK until the end of this turn
Hey, that might be relevant for some death trigger payoffs like Blood Artist or Grave Pact
Act of Heroism Adeline, Resplendent Cathar Ajani, Mentor of Heroes Amateur Hero Anthousa, Setessan Hero Aragorn, Hornburg Hero Benalish Hero Blur of Heroism Brigid, Hero of Kinsbaile Changeling Hero Chronicler of Heroes Colossal Heroics Contract Hero Crovax, Ascendant Hero Devoted Hero Dreamtail Heron Earth's Mightiest Heroes Elspeth, Undaunted Hero Fabled Hero Folk Hero Forge of Heroes Frodo, Determined Hero Frontline Heroism Gerrard, Weatherlight Hero Goblin Hero Heartfire Hero Hercules, Olympian Hero Here Comes a New Hero
There are some excellent options, especially interactive ones, like Cathar Commando, Cast Down, and Dress Down that make for delightful surprises off the top of your deck
Cant say the high dollar cards, lets just speculate their will be one of the famous planeswalker that have the mana cost 1BB