The downside is that they are so faithful that they often are chock full of mostly useless cards
good choices to get this effect off when your opponent tries to target negate it
When Jaden activates "Form Change", he announces "I activate my Quick-Play Spell, Form Change!" When Jaden activates "Fusion Recovery", he announces "I activate my Spell Card
Crystron Quandax X WATER Level 4 [ Machine / SynchroTunerEffect ] ATK 1800 DEF 2000 1 Tuner + 1+ non-Tuner monsters Once per Chain, during your opponent's Main or Battle Phase, you can (Quick Effect): Immediately after this effect resolves, Synchro Summon 1 Synchro Monster, using materials including this card you control
And finally, even if you just want to replicate your real-life deck in the game, you can't do that until you unlock the cards in the game
Accel Synchro Stardust Dragon Though Loading