Collector boosters include: 1 traditional foil Booster Fun rare or mythic rare 1 non-foil Booster Fun rare or mythic rare 1 non-foil extended-art rare or mythic rare 1 non-foil extended-art Commander rare or mythic rare 1 traditional foil rare or mythic rare 1 traditional foil basic land 1 traditional foil common or uncommon, 2 non-foil commons or uncommons 2 traditional foil uncommons 4 traditional foil commons 1 traditional foil double-sided token Booster fun refers to whatever special treatments artists and designers give to cards in a specific set
Cycling is an activated ability of a card you could cast, not the casting of the spell outright
If youre willing to wait until your fifth turn to have found the needed legendary creatures and are happy with a 75% chance of having Kolvori be a 6/6, then you only need a mere thirteen non-Kolvori legendary creatures, which is a much easier number to come to and still sounds acceptable to me
Compare with Birthing Pod from New Phyrexia (an artifact with 3+Phyrexian Green Mana casting cost, activation: 1+Phyrexian Green Mana, Tap, Sacrifice a creature: Search your library for a creature card with converted mana cost equal to 1 plus the sacrificed creature's converted mana cost, put that card onto the battlefield, then shuffle your library