But see if you use this card with reverse time/ eternity you could basically wipe the board. If I play a massive dragon with 30 hp, you would just wait 5 turns then reverse it. Even sapphire chargers, normally immune to the procrastination shield, would be affected. In addition, it's a permanent, so there's really nothing stopping you from throwing 6 of them on the field. Even decks with good permanent control would have issues. If you made it more expensive it would reduce spamming, or perhaps make it a shield so that only one can be out at a time.