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 Rosenix 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. Activate Crystron Rosenix's effect in the graveyard, banishing itself and summoning a Crystron Token
Step 5. Link Summon Crystron Needlefiber using the Tuner and Scrap Recycler/Mathematician
Step 6. Using Needlefiber's effect, special summon Crystron Rion from the deck
Step 7. End your turn
During the opponent's turn,
Step 8. Activate Rion's effect, special summoning Rosenix from the banish zone and Synchro Summoning a Level 7 Machine Monster
Step 9. Activate Needlefiber's effect, tributing itself to synchro summon Formula Synchron from the extra deck
Step 10. Activate Formula Synchron's effect, Synchro Summoning Crystron Phoenix using itself and the level 7 machine synchro