Codebreaker

After Tri-Heart is set up, if you have 2 effect monsters to summon beneath him, you can use them to make Virus Swordsman (Link 2) under Tri-Heart's down-center arrow.

If Virus is co-linked when it's Link Summoned he summons Zero Day from Hand/Deck/GY, which you'll use together to make Virus Berserker once again directly under Tri-Heart. Berserker will then summon the other two, and using those three you can make Apollousa with 3 materials (Link 2+2 other monsters = 3 negates).

Baronne

Baronne can be made with Visas + Reichheart, or Parallel eXceed while eXceed is still lv4, if you had summoned it at any point depending your hand. Typically with Visas+Reichheart, the line can be (2-card combo):

• Normal any Scareclaw and Link into Light-Heart, search Field.
• If you already have Reichheart in hand, or you used it as your normal summon and searched Arrival, then search for Visas with the Field. If you already have Visas, then search Reichheart instead.
• Visas SS itself by destroying the Link-1. Revive Reichheart with Arrival, then Visas+Reich = Baronne. If you had more extenders and Reichheart was still in hand then you can just SS Reich from hand and Synchro that way. In general, again, him and Parallel eXceed will be the only lv4s you use with Visas' 6.

Obviously this is a Synchro line you mostly get to benefit from if you have even more extenders to still make your Tri-Heart plays, unless you really want to end on a single Baronne.

Cicada King

Cicada King just overlays any lv3s, which the deck is full of. It's just an extra monster negate that's a bit easier to make compared to Baronne.