There are other cards with an even narrower scope, like Marisi, Breaker of the Coil and Basandra, Battle Seraph, both of which only affect the game during the combat phase instead of an entire turn
Then he promptly dies, but not before passing on the code, and the Numeron Dragon card, to Mizael, whom he admits is the better dragon tamer, showing an Always Someone Better moment (though it's changed to himself in the dub)
Sorry this happened and good luck
Having played with and against this card, its much more challenging to play with and against, since people can craft piles with cards like Eternal Witness, Snapcaster Mage, Ravens Crime, or Life from the Loam to basically guarantee access to what they want
In fact, it's not unheard of a Stardust Accelerator player to be stuck with their initial three Synchro monsters for most of the game, since additional Synchros only become accessible in the late or postgame
Reactor Raid gives you value in the early game, the mid game, even the late game