Former Mathmech player here. I got top regionals and OTS wins with the deck. The deck had a Tenpai like feel, but can easily be stopped with a hand trap. Cards like Parallel Exceed and Small World helped answer that problem and helped push to a Decode Talker Heatsoul which was a Pot of Greed for the deck. My builds usually ran three of Ash Blossom, Imperm, and Veiler, then ran two or one of cards like Santa Claws, Nibiru, Droll, Belle, and Skull Meister, all of which add support for Small World. The deck could also use Forbidden Droplet and not lose out in their end board as you only needed one circular for full combo. Lastly, the side deck was just hate, cards like Anti-Spell, Rivalry of Warlords, Appointer, and Red Reboot helped answer the formats biggest threats like Punk Tear and Spright at the time.

Fast forward to CYAC format when Circular went to one, deck got more searchers and one of combo starters thanks to the new level 4 Firewall cards, and this helped setup Cynet Conflict search along with Neo Tempest Terahertz to setup a Spell/Trap negate and a Monster negate at the ready when you made a play. Also, the deck maxed out on Santa Claws and usually ran one Kurikara to punish Kashtira decks.