This toolbox deck has an answer for any type of situation and you'll be able to navigate a duel as you intend. You can make problem removal boards with Enterblatnir, Utgarda and Lavaetein, you can go for a full control board with Harr, Mechaba and Hyperyton or just go for a straight beatdown with big attack generaider monsters and jormungandr that by opponent's turn would at least be at 4000 atk and would continously gain 1000atk at each turn while triggering your combos.
To enable those strategies you have a plethora of support monsters.
-Condemned witch (with a free forbidden negate card) into loki into any generaider monster card (mardel into boss quest or boss stage in the worst situation to get your pieces)
Dogmatika and Aleister the invoker (which can both be tributed by Harr as they are spellcasters) into the Invoked or Dogmatika combo. The dogmatika combo should always be last as it will prevent you from ss from the extra deck for a turn and Eclesia can special summon itself if there is an extra deck monster anyway, no need to use a normal summon for it. Mechaba is a valid target for Monstrosity.
Metalcruncher (either on its own if you have no monster or via monstrosity) into Flying Pegasus . Then pegasus into any Xyz 9 with a free ss from grave of metalcruncher or cannon core. All valid targets for monstrosity as well.
Pot of prosperity for extra draw power as you're not overly reliant on extra deck, pot of avarice to recharge your spent generaider and extra deck cards with more drawing power
Additional tech cards like trias hierachia or gizmek kaku that work well in the deck but are more situational.
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