For example, the SEC cards in OP01 Romance Dawn are Shanks (OP01-120) and Yamato (OP01-121)
At the beginning of combat on your turn, target creature you control connives
So your big Fireball-style cards turn into big draw spells as well
While it's possible to play quickly with Sensei's Divining Top, it's more common that tournaments devolve into people playing with Sensei's Divining Top for the first time and turns going something like this: e nd of your turn, activate Top, spend 45 seconds rearranging the top of my library, pause to think for 15 seconds, crack a fetch land, use the mana to activate Top, spend 45 more seconds rearranging the top of my library, untap, draw for my turn, activate Top, spend 45 seconds rearranging the top three cards of my library, rinse and repeat