AGOV-JP042 厄災の星ティ・フォン Logiastellar T-PHON (Stellar Nemesis T(Y)-PHON – Doomsday Star)
Rank 12 DARK Fiend Xyz Effect Monster
ATK 2900
DEF 2900
Materials: 2 Level 12 monsters
You can also Xyz Summon this card by using 1 monster you control with the highest ATK during the turn, or the next turn after, your opponent Special Summoned 2 or more monsters from the Extra Deck. (Transfer its materials to this card.) If Summoned this way, you cannot Normal or Special Summon other monsters for the rest of this turn.
(1) Neither player can activate the effects of monsters with 3000 or more ATK while you control this Xyz Summoned card.
(2) Once per turn: You can detach 1 material from this card; return 1 monster on the field to the hand.

Note: Its Japanese Name means basically Logic of the Stars.

It’s also named after Typhon, a nightmare monster born from Gaia by her copulating with the darkest regions of the underworld, Tartarus, as revenge against the Olympians for betraying her.

As a result, while it sounds like T-PHON, there’s a non-zero chance of articulating it as TY-PHON.