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. : Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
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.
23-06-2020
wotc
If Riddleform becomes a creature the same turn it enters the battlefield, you can't attack with it unless it gains haste.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.