1 Tuner + 1+ non-Tuner monsters
If this card is Special Summoned: You can add 1 Spell/Trap that mentions «Crimson Dragon» from your Deck to your hand. (Quick Effect): You can target 1 Level 7 or higher Synchro Monster on the field, except «Crimson Dragon»; return this card to the Extra Deck, and if you do, Special Summon 1 Dragon Synchro Monster from your Extra Deck with the same Level as the targeted monster. (This is treated as a Synchro Summon.) You can only use each effect of «Crimson Dragon» once per turn.