Ancient Tome

Effect: During your Main Phase you can exchange 1 card in your hand with the top card of your Deck. This effect can only be activated once per turn. Discard 1 card from your hand during each of your Standby Phases. If you do not, destroy this card.

Rulings
The effect of swapping a card from your hand with the top card of your deck is an effect and can be chained to. The Discard of this card is a maintanence cost.