Petrification

Enchant Creature
Enchanted Creature gains Defender, becomes
a 0/2 colorless artifact. Neither it's power nor
toughness can be increased by any means. Its
activated abilities can't be activated.
Discard a Card,{1}{b}: Return Petrification to
your hand.
"Few spells that effectively remove the need to worry
bout victim yet can be reversed at need."