Aiden, Secret Santa

{b/g}{b/g}{b/g}{b/g}{b/g}Secret—(From your hand, you can put this card secretly underneath any card. Once per turn; you may move it to another card. If it get's noticed by an opponent, at the beginning of your next upkeep; you have to pay it's secret cost. If you can't, you lose the game.)
When this card is noticed, it gains all of the
power, toughness, and abilities of each card
it was underneath.