If a creature in combat has first strike or double strike, you can activate the ninjutsu ability during the first-strike combat damage step
For example, you can't sacrifice a Food token to activate its own ability and also to activate Maraleaf Rider's ability
Another deck could be built around a Pokmon whose Ability accelerates Energy
However, cards that allow you to re-flip coins and ensure you get the result you want can be extremely useful, since thatd allow you to turn the scales in your favor either to destroy your opponents creatures or to save any of your own that aren't of the proper creature type
Unfortunately, there are only 17 Dinosaurs that have flying, plus three creatures with changeling and flying, so a total of 20, or 21 if you count Indominus Rex, AlphaIndominus Rex, Alpha, but I dont, so 20 it is
DJ Scarab God Yo, whaddup