Accel Synchron

Level 5 DARK/Machine Synchro Tuner Effect
500 ATK / 2100 DEF

1 Tuner + 1+ non-Tuner monsters
Once per turn: You can send 1 "Synchron" monster from your Deck to the GY, then activate 1 of these effects;
● Increase this card's Level by the Level of the sent monster.
● Reduce this card's Level by the Level of the sent monster.
During your opponent's Main Phase, you can (Quick Effect): Immediately after this effect resolves, Synchro Summon using this card you control. You can only Synchro Summon "Accel Synchron" once per turn.

Rulings – Yugipedia

Printings:

Synchron Extreme Structure Deck: SDSE-EN042 (Super Rare) - 2015-08-27
Legendary Duelists: Magical Hero: LED6-EN028 (Common) - 2020-01-16
Legendary Duelists: Season 3: LDS3-EN120 (Common) - 2022-07-21

Prices:

Cardmarket: 0.15 €
TCGplayer: $ 0.20