Very Deep Pit

At the beginning of your upkeep, you may pay {1}{b/g}. If you do, put a nonland permanent card on top of Very Deep Pit.
If this card is a creature, it loses all abilities, cannot block, and has base power/toughness 1/1.
If it is any other permanent, you may cast it at the beginning of your next upkeep without paying its mana cost.