Soul Seizer // Ghastly Haunting
Flying
When this creature deals combat damage to a player, you may transform it. If you do, attach it to target creature that player controls.
Enchant creature
You control enchanted creature.
The body often twists and flails spasmodically as the spirit explores its new home.
Illustrated by Lucas Graciano
This printing
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If Soul Seizer leaves the battlefield in response to its triggered ability, you won't be able to transform it and it won't return to the battlefield or become attached to the target.
You choose the target for Soul Seizer's triggered ability when that ability triggers and goes on the stack. You choose whether or not to transform it when that ability resolves. If the creature is an illegal target by that time, the ability doesn't resolve and none of its effects happen. You can't have Soul Seizer transform.
If Soul Seizer has any +1/+1 counters on it when it transforms, they remain on Ghastly Haunting. They won't affect the power or toughness of the enchanted creature, however.
Related cards
Dark Ascension Checklist
Lantern Bearer // Lanterns' Lift
Mirrorhall Mimic // Ghastly Mimicry
Dorothea, Vengeful Victim // Dorothea's Retribution
Gutter Skulker // Gutter Shortcut
Katilda, Dawnhart Martyr // Katilda's Rising Dawn
Faithbound Judge // Sinner's Judgment
Mischievous Catgeist // Catlike Curiosity
Binding Geist // Spectral Binding
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Treachery