Cyber Dragon Core (Quarter Century Secret Rare) (RA04-EN013) - Quarter Century Stampede 1st Edition Number_DPCT-ENY07 You cannot attack your opponent

You cannot attack your opponent directly if you attack any monsters first

your side of the field

Card Text This legendary dragon is a powerful engine of destruction

except "tellarknight" monsters

Cyber Dragon Core (Quarter Century Secret Rare) (RA04-EN013) - Quarter Century Stampede 1st Edition Number_DPCT-ENY07 You cannot attack your opponentTypeMachine Effect Monster AttributeLIGHT Level Rank2 ATK DEF400 1500 Card TextThis card's name becomes "Cyber Dragon" while on the field or in the GY. If this card is Normal Summoned: Add 1 "Cyber" Spell Trap from your Deck to your hand. If only your opponent controls a monster: You can banish this card from your GY; Special Summon 1 "Cyber Dragon" monster from your Deck. You can only use 1 "Cyber Dragon Core" effect per turn, and only once that turn.