Prismatic Ending can hit problematic permanents like Aether Vial and Amulet of Vigor but fails to remove bigger threats like Thought-Knot Seer and Primeval Titan so both spells should see play
Note this doesn't have to be your dork that died, just any dork
However, if your objective is to win your draft, you shouldnt go anywhere near this
Like most Pokmon cards, the value of Dratini depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Silver Tempest)
While this is certainly easier to do in 4 color partner builds or 5 color decks, as those mana bases usually need to lean almost exclusively on basic lands to ensure consistent access to all colors, there are more than enough nonbasic lands out there at this point that you could play this instant speed tutor in any deck containing black