thys quandax

Step 1. Normal Summon Scrap Recycler or Mathematician, then activate their effect, sending Crystron Sulfefnir to the graveyard
Step 2. Activate Sulfefnir's effect in the graveyard, discarding Crystron Thystvern and special summoning itself
Step 3. Activate Sulfefnir's effect on the field, tributing itself to special summon any Crystron tuner from the deck
Step 4. Link Summon Crystron Needlefiber using the Tuner and Mathmatician/Scrap Recycler
Step 5. Using Needlefiber's effect, special summon Crystron Quan from the deck
Step 6. Activate Crystron Thystvern's effect, banish itself and add Crystron Rosenix
Step 7. End your turn
During the opponent's turn
Step 8. Activate Crystron Quan's effect, Special Summon Crystron Rosenix and Synchro Summon a level 5 Synchro
Step 9. Activate Crystron Needlefiber's effect, Tributing itself to synchro summon Crystron Quandax from the extra deck
Step 10. Activate Crystron Quandax's effect, Synchro Summoning Crystron Phoenix using itself and the level 5 Synchro