Terror of Towashi
Creature — Phyrexian Ogre
Deathtouch
Whenever this creature attacks, you may pay 
. When you do, return target creature card from your graveyard to the battlefield. It's a Phyrexian in addition to its other types.
Lius Lasahido
March of the Machine (MOM)
• #378Rulings
The effect making the creature a Phyrexian doesn’t have a duration. It lasts until the creature leaves the battlefield.
(wotc • 2023-04-14)
If the creature stops being a creature after the ability has resolved, it will also stop being a Phyrexian until it becomes a creature again, if applicable.
(wotc • 2023-04-14)
Terror of Towashi’s triggered ability triggers and goes on the stack without a target. If you pay {3}{B}, the second “reflexive” triggered ability will trigger. You’ll choose the target creature card for that second ability at that time.
(wotc • 2023-04-14)
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Rulings
The effect making the creature a Phyrexian doesn’t have a duration. It lasts until the creature leaves the battlefield.
(wotc • 2023-04-14)
If the creature stops being a creature after the ability has resolved, it will also stop being a Phyrexian until it becomes a creature again, if applicable.
(wotc • 2023-04-14)
Terror of Towashi’s triggered ability triggers and goes on the stack without a target. If you pay {3}{B}, the second “reflexive” triggered ability will trigger. You’ll choose the target creature card for that second ability at that time.
(wotc • 2023-04-14)