I never play Demonic Tutor in tempo driven decks but I frequently play Vamp and it is great
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The fact that you can cast Tiamat with this in play and put five dragons on the table is very interesting and splashy, but in competitive MTG, this spells win more. Either way, this card can create loops when you cast a dragon again and again for free, but youre either cheating Dracogenesis into play or dumping 8 mana into it Omniscience is already a thing, by the way
This makes it possible to keep Greninja on the bench, steadily distributing damage throughout the game
Utopia has the number 9 in the ones column while Dark Mist has the number 9 in the tens column