If first non-Lemur creature spell with flying you cast on your turn doesn't have generic mana in its cost, the cost will not be reduced and the cost reduction will not apply to the next spell you cast that turn
And really its not very close
All is Dust This is the opposite of cheap and not even that reliable

5 Traditional foil borderless scene rares (12.36%) 1 Traditional foil borderless scene mythic rare (1.24%) 1 Traditional foil rare or mythic rarecan be any of the following: 32 Traditional foil rares (82.05%) 14 Traditional foil mythic rares (17.95%) 1 Non-foil extended-art rare or mythic rarecan be any of the following: 16 Non-foil extended-art rares (97%) 1 Non-foil extended-art mythic rare (3.0%) 1 Traditional foil rare or mythic rare that's an alternate-frame, extended-art, or borderless card, or one of the following: 2 Traditional foil borderless rares (4.95%) 8 Traditional foil borderless mythic rares (9.91%) 14 Traditional foil showcase memory corridor rares (34.67%) 5 Traditional foil showcase memory corridor mythic rares (6.19%) 16 Traditional foil extended-art rares (39.62%) 1 Traditional foil extended-art mythic rare (1.24%) 5 Textured foil showcase memory corridor mythic rares (3.25%) 4 Double rainbow serialized cards (500 of each) 1 Foil-etched rare or mythic rarecan be any of the following: 32 Foil-etched rares (82.05%) 14 Foil-etched mythic rares (17.95%) 1 Traditional foil double-sided token *Note: Probabilities may not sum to 100% due to rounding

1 Trainer Tropical Mega Battle is the only one to receive a Pristine 10 rating from CGC
The same applies to turn-based countdown timers, which are always there, but hidden up until the point that a player might be running out of time, so that it doesnt cause any unnecessary anxiety