Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand or Graveyard) by sending 4 face-up Level 1 monsters you control to the Graveyard, and cannot be Special Summoned by other ways. Other monsters you control cannot attack. During either player's Battle Step, once per battle involving this card: You can banish 1 Level 1 monster from your Graveyard; until the end of the Damage Step, this card is unaffected by other cards' effects, also it cannot be destroyed by battle.
ATK 300DEF 200
If this card is Tributed: Draw 1 card. If your monster would be destroyed by battle, you can banish this card from your GY instead.
During your opponent's Main Phase or Battle Phase: You can target 1 of your banished non-Tuner monsters; Special Summon it, but it has its effects negated (if any), and if you do, immediately after this effect resolves, Synchro Summon 1 Machine-Type Synchro Monster using only that monster and this card (this is a Quick Effect). These Synchro Materials are shuffled into the Deck instead of being sent to the Graveyard. You can only use this effect of "Crystron Rion" once per turn.