Most people can't remember the exact position of 60 cards as they're laid out into piles and those piles reassembled, so this process causes the player to lose information about what's in their deck just like a riffle shuffle does
Soul Feast and Renounce fueled additional draws from the Bargain, and Yawgmoths Will was eventually a way to get enough extra power to get over the hump and actually finish someone off
The key is balancing pressure use Tiana and Moana early, scale into Queens midgame, and close the storybook with overwhelming lore generation.
And if thats not a reason to play Choco, Seeker of Paradise, I dont know what is
Also, the card itself needs to be the mech, so while Void might have one of the better art representations of a mech, it doesnt count here
Being able to go off the rails and do a bunch of weird stuff is refreshing in a way, sort of like Marvel's "What If..." series