If you control three or more Wizards while you control Docent of Perfection, it wonâ€™t transform yet. It only transforms while its triggered ability is resolving after you cast an instant or sorcery spell.
For more information on double-faced cards, see the Shadows over Innistrad mechanics article (http://magic.wizards.com/en/articles/archive/feature/shadows-over-innistrad-mechanics).
Docent of Perfectionâ€™s triggered ability resolves before the spell that caused it to trigger.
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