You can only use 1 "Raidraptor - Bloom Vulture" effect per turn, and only once that turn, also you cannot Special Summon monsters the turn you activate either of these effects, except DARK monsters
Potential ways to track this include writing theme down on paper or using dice, but any method that is clear and mutually agreeable is fine
Dont get tripped up by the first field (X=x) because that is the probability that you draw exactly one copy of a card, not the probability that you draw it at all
Technically speaking this is not a hard rule, as the true determining factor of which evolution will occur is the order in which the evolutions are listed in the code of the Dim card, but so far there have not been any Dim cards that have broken the pattern as described
By revealing 1 monster from your Extra Deck, you banish all cards in your opponents Extra Deck with the same name as the revealed card