Since the Prototype mechanic is still very new, it's hard to tell how this will play out
once its on the battlefield, you can hold off casting your Dragon spells (and artifact spells) until the optimal time, since they have flash
Note those are worded to work for each one that does so, not just one per combat or player
Once a permanent has been flipped, it's impossible to flip the permanent back again
Bruce Banner 0.2%inclusion 8 decks 5.12K decks Karolina Dean, Runaway 0.9%inclusion 6 decks 643 decks The Thing 0.4%inclusion 3 decks 789 decks Thanos, the Mad Titan 0.2%inclusion 3 decks 1.91K decks Nick Fury, Agent of S.H.I.E.L.D
But while both used to be cheap, Vandalblast rose in value massively and is now 3.99 but Into the Core is just 20 cents