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Rulings
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.
If Riddleform becomes a creature the same turn it enters the battlefield, you can't attack with it unless it gains haste.
If Riddleform becomes a creature the same turn it enters the battlefield, you can't attack with it unless it gains haste.
Rulings
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.
If Riddleform becomes a creature the same turn it enters the battlefield, you can't attack with it unless it gains haste.
If Riddleform becomes a creature the same turn it enters the battlefield, you can't attack with it unless it gains haste.
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