If the removal spell only does 3 damage, then it doesn't matter if it's one mana if it's not going to be able to deal with enough permanents to justify including
In contrary to the other creature-based decks, Vampiric Bloodlust has a decent amount of board control with Merciless Eviction and Fell the Mighty as major board wipes and a lot of single-target removals
You can't freely exile any card you like from your yard either as you have to pay attention to your recursion and reshuffle effects for cards you may well need again
You may be large, my friend, but you're not too scary
To my mind, Commander is at its best when youre playing extravagant, high-mana spells, and Thryx facilitates that
2024-01-12 If you're drawing multiple cards, each draw is performed one at a time