Link Summon Selene with Sheep + the revived monster, then activate her effect to Special Summon back Endymion
Yes, even in Rush Duel, there is reference artwork
As with the activated effects that change original ATK/DEF, previous increases or decreases are reapplied
He can immediately Tune it to End Master for a Level 8 Synchro Summon, but if he can hold off and Summon Supay or Fire Ant Ascator, hell be able to get his second Synchro Monster
In fact, out of the top 32 players in the tournament, a staggering 26 were rocking the same strategy - a Yugioh deck archetype known as Ishizu Tearlaments
That being said, these are aesthetically-appealing, well-designed cards with an interesting mechanic revolving around their ability to send cards to and from the Graveyard in order to extend their combos and potential