Whenever you cast a noncreature spell, you may have Riddleform become a 3/3 Sphinx creature with flying in addition to its other types until end of turn. {2}{U}: Scry 1.
2020-06-23
If Riddleform becomes a creature the same turn it enters the battlefield, you can't attack with it unless it gains haste.
2020-06-23
Riddleform's first ability resolves before the spell that caused it to trigger but after targets for that spell are chosen. It will resolve even if that spell is countered.