Early Synchro monsters were incredibly generic, and that trend has held up into the modern era, as the best Synchro monsters of all time are usually generic cards that can be utilized by a wide variety of strategies
Glimmora exs only attack, Poisonous Gem, does 140 base damage with the added effect of poisoning your opponents active Pokemon, which adds another ten points of damage each turn
During your opponent's next turn, prevent all damage done to this Pokmon by attacks from Basic non-[C] Pokmon
...you are going to be zooming through your deck while keeping your opponent's forces at bay, while he or she is struggling to get any damage in at all
First up is another card from the Forgotten Realms, and its called Death-Priest of Myrful, which is a four mana 2/2 that gives Skeletons, Vampires and Zombies +1/+1, and allows you to create a 1/1 Skeleton token in your end step if a Creature has died that turn
For specific character targets, singles are still the safer route