Core Set 2021 · M21 · uncommon
Enchantment
wotc · 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.
wotc · 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.