Convulsing Licid
Creature — Licid
: This creature loses this ability and becomes an Aura enchantment with enchant creature. Attach it to target creature. You may pay to end this effect.
Enchanted creature can't block.
Scott Kirschner
The List (PLST)
• #STH-77Rulings
If a spell that can target enchantments but not creatures (such as Clear) is cast targeting the Licid after it has become an enchantment, but the Licid's controller pays the cost, the Licid will no longer be an enchantment. This will result in the spell failing to resolve for having no legal targets.
(wotc • 2013-04-15)
Paying the cost to end the effect is a special action and can't be responded to.
(wotc • 2013-04-15)
Rulings
If a spell that can target enchantments but not creatures (such as Clear) is cast targeting the Licid after it has become an enchantment, but the Licid's controller pays the cost, the Licid will no longer be an enchantment. This will result in the spell failing to resolve for having no legal targets.
(wotc • 2013-04-15)
Paying the cost to end the effect is a special action and can't be responded to.
(wotc • 2013-04-15)