IIRC in Yugioh there is only a certain number of Blue-Eyes (from the show?), so you could put a rule on the card 'there may only be X Blue-Eyes on the battlefield at any time', Star Wars CCG used to have permanents that you could have 2 or 3 copies of in play, in addition to stuff you could only have 1 of, the concept would work fine here too, only this could care about both players' boards
If a player were fortunate enough to make it far enough through the competition to finish in second place overall, he or she would receive this number two trainer card
If you've played for any length of time you may be familiar with the likes of Mystical Tutor or Worldly Tutor in Blue and Green respectively
You need to pick one and design your deck with the aim of making it as consistent and powerful as possible
Called By The Grave is semi-limited for how good it is, and a great staple card for any deck
How priority and the stack work