The mana cost definitely holds it back, but if you end up with a good mana base that can actually make this happen, obviously enough, Tiamat will feel like a bomb
For instance, what about: Creatures (4) Planeswalkers (2) Lands (25) Spells (29) Everybodys so caught up on Teferi, Time Raveler that we might do well to sidestep that entire topic
See the storage guide TCGPlayer and eBay have listings
One mixed blessing is that Quick Draft is ranked, so as you get wins you will rank up and the caliber of your opponents will increase
Since you're already incentivized to be loading up your hand, you can realistically expect the activated ability to give a functional +5/+5 or greater
The Ninth Doctor Since time counters on suspended cards get removed each upkeep, having multiple upkeeps gets rid of multiple counters and is why The Ninth Doctor is such an important card from Timey Wimey