But you don't actually get them back. You just shuffle them into your deck, enabling you to possibly draw them again. Instead, you could just be playing more spells. I mean, unless you're plan is just to answer all of their cards and eventually deck them. But since you're playing creatures, I thought your plan was to attack them to death.
I suggested a Common that will let you get spells you want out of your graveyard: Archaeomancer.
I would just straight cut some combination of 4 cards from Duress and Despise. They're really weak late-game and you don't really have time to cast that many early. They're not universally useful and you don't actually want them in most matches.
You have to cut something for lands, because you just don't have enough to cast your spells in any reasonable time period. You have no cantrips to draw more lands and no other cards that help you get mana.
The actual act of performing the combo is an infinitely looping action that you must perform over and over. Since the action doesn't advance the game state every time and you are going to perform it an indefinite number of times (because of the way the combo works, you can need to perform it anywhere between 10 and infinity times), performing the action is Slow Play and can/will result in a warning for Slow Play at any competitive-RL event.
High Tide doesn't require repeating an infinitely looping action, so unless you spend too much time thinking between actions on your combo turn, you probably aren't going to get very many Slow Play warnings playing it.
It's specifically that the combo requires an infinitely looping action and can't be short-cut that makes it prone to Slow Play warnings.
I mean, if you're going to carry around a computer and have the required knowledge, sure, I guess? I don't have the required knowledge to confirm or deny this.
I'm pretty sure you can't have a computer on the table during a tournament match, though. Not sure how you'd get this to work. You'd probably have to call a judge to resolve the Scrambleverse, in any case.