Some of the coolest cards I have are 1st edition Ampharos, Slowking and Kingdra (rescued from my nephew when his mother was going to throw it out)
OP-16 Buggy Deck Guide: Blue Impel Down Swarm Build: OP-16 Buggy deck guide
The Radiant Greninja can also take some early KOs on stuff like Bidoof
However, this can vary in a control deck where creature spells are minimal, possibly only including a few, if any
With some very distinct mechanical themes Eldrazi, Energy, Lhurgoyfs and Lands the majority of the new cards in the precons are very specifically geared toward certain themes
When going second, Nadir Servant could be used to send Elder Entity Ntss from Extra Deck to graveyard, to destroy 1 card on the field, or send Golden Cloud Beast Malong from Extra Deck to graveyard, to return 1 face-up opponents monster to hand