Odds are you'll have to use mana for removal to push Tinybones through, so how much mana will you really expect to have left over
I really enjoy the freedom to Pact of the Serpent with reckless abandon since so many elves can gain you that life right back like Wellwisher and Marwyn, the Nurturer
There are multiple very relevant threats which survive Lightning Bolt but die to Heat, such as [card]Yawgmoth, Thran Physician, Omnath, Locus of Creation, Crashing Footfalls, Primeval Titan, most Planeswalkers, Yorion, Sky Nomad, and the list goes on
A concrete use case You come back from a card swap meet with 80 cards bought as a lot
Just too much value for a single cardboard rectangle
The boosters will each include 20 cards, including two legends and a foil card