Haste and a power boost are amazing with creatures that care about dealing damage or attacking, like Ilharg, the Raze-Boar, or Professional Face-Breaker
Sure, you only get one of the three cards into your hand, but the others going into your graveyard is easily exploitable
In the show, the comets arrival is predicted long before it appears
It needs to survive to your next upkeep at the earliest, which leaves it vulnerable to enchantment removal before paying off
Creature - Human Scout Ramp (CTRL to add secondary) Removal Removal (CTRL to add secondary) Sorcery Yuna's Decision Choose one Continue the Pilgrimage Sacrifice a creature
The best case is that you are ahead on mana, ahead on cards in your hand, and ahead on board presence while setting your opponent back