Then put all cards exiled this way that weren't cast on the bottom of your library in a random order." A spell's mana value is determined only by its mana cost
When Minsc & Boo, Timeless Heroes enters the battlefield and at the beginning of your upkeep, you may create Boo, a legendary 1/1 red Hamster creature token with trample and haste.+1: Put three +1/+1 counters on up to one target creature with trample or haste.2: Sacrifice a creature
On one hand, Vesuvan Shapeshifter can keep copying the same value morph creature for a turn-by-turn advantage
The four cards I'm thinking of are very situational
119.4b Next, damage that's been dealt is transformed into its results , as modified by replacement effects that interact with those results (such as life loss or counters)
That is all to say the odds of having Swooping PteranodonSwooping Pteranodon with other flying Dinos is low, not zero, but low