Cards like this are great for two reasons
If at least one target is still legal, the spell or ability does as much as it can to the remaining legal targets, and its other effects still happen
Or rather, they can be, but it depends on the context
You can also drop Hexdrinker on a later turn and immediately level it up to at least the "protection from Instants" level, which will protect it from Erode, Doom Blade, Lightning Bolt, and Fatal Push
A real Pokmon card measures 2.5 inches by 3.5 inches
So many new Magic cards incentivize Commander players to make their mana curves lower and lower, Im glad to see some incentives in the other direction