Goat format ruling
Summoner of Illusions
Card effect (current official text)FLIP: Tribute 1 other monster, and if you do, Special Summon 1 Fusion Monster from your Extra Deck, but destroy it during the End Phase of this turn.
Rulings
- Tributing 1 monster is a cost.
- You must use Summoner of Illusions’ effect when it is flipped face-up, either by Flip Summon or by being attacked. If you have no cards in your Fusion Deck, the effect cannot activate and you do not Tribute 1 monster.
- If the Fusion Monster summoned by this card’s effect is Set it will not be destroyed during your End Phase, since the condition is reset when the monster becomes face-down.If "Fiend Skull Dragon" is summoned by the effect of "Summoner of Illusions," that "Fiend Skull Dragon" will immediately negate the effect of "Summoner of Illusions" and will not be destroyed at the end of the turn.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.