When you Tribute Summon a monster: You can Special Summon this card from your hand, and this card's Attribute, Type and Level become the same as the Tribute Summoned monster's.
Out of all of the cards in Return of the Duelist, this one caught my atention the most. THis card could single handedly bring back the reign of the Monarchs. This can be used in a variety of decks, hell you could even make weird hyrbid decks with this card and it would still be great.
This card in Monarchs is just great, it opens up a level 6 xyz engine (5 aswell if you're running Zaborg, but that's just silly). This card can be recycled with Constellar Ptolemys Messier 7 to quickly swarm the field, or you could use it in conjunction with Ultimate Offerings, Constellar Ptolemys Messier 7 and a Monarch hand to gain complete control over your opponent in a single turn.
Another potentional deck idea that I though of was using it in a Salvage Warrior/Quickdraw deck. You would special summon Quickdraw then tribute it for Salvage Warrior, whip out Illusion Snatch and get your Quickdraw Synchron back. I can't think of another deck that would have this great of a level 5 xyz engine except for Wind-Ups.
Salvage Warrior: When this card is Tribute Summoned, you can Special Summon 1 Tuner monster from your hand or Graveyard.
Constellar Ptolemys Messier 7: 2 Level 6 monsters
You can also Xyz Summon this card by using 1 face-up "Constellar" Xyz Monster you control as the Xyz Material, except "Constellar Ptolemys Messier 7". (Xyz Materials attached to that monster also become Xyz Materials of this card.) You cannot activate this card's effect the turn you Special Summon this card this way. Once per turn: You can detach 1 Xyz Material from this card to target 1 monster on the field or in either player's Graveyard; return it to the hand.
You can Special Summon this card (from your hand) by sending 1 monster from your hand to the Graveyard. For a Synchro Summon, you can substitute this card for any 1 "Synchron" Tuner monster. This card cannot be used as a Synchro Material Monster, except for the Synchro Summon of a monster that lists a "Synchron" monster as a Tuner.