Sisay works well as the basis for typal decks, combo decks, attrition strategies, or just high-power five-color 'good-stuff.' It gets truly out of hand once you hit ten mana, after which you can double-tutor every turn and close the game out quickly
10 Most Valuable Cards in Paldea Evolved 10 Most Valuable Card in Paldea Evolved, Ranked 10
I begin to lose my enjoyment of the card
Grim Tutor Is this what you were looking for
Demonic Tutor is so overpowered that it's either banned or limited in most formats, except for Commander, a format in which it is considered a staple for any deck that includes black
Several changes below suggest removing the cards that die to the Raptor to retain the powerful ramp piece, but removing the Raptor itself is a reasonable course of action as well