Divulge

One of the aspects of magic that give it so mauch drama and excitement is the incomplete information created by a player's hand. Your opponent not knowing what is in your hand is valuable, but how valuable is it ? This lgot me thinking of a keyword "Divulge [Cost] - [Effect]" meaning "[Cost], Remove this card in your hand from the game: [Effect], As long as this is removed from the game, you may play it." For example:
Mana Erosion UU
Instant
Counter target spell unless it's controller pays 3
Divulge U - Draw a card
You get the divulge effect but then your opponent knows you have the card in your hand.